Magnetic Field Questions and Answers

10 A proton moves at right angles to a uniform magnetic field of 0 8 T If the speed of the proton is 3x10 7 m s what is the magnetic force exerted on the proton Round scientific notation decimal to nearest hundredth e g 2 33x10 6

11 A stationary proton is placed in a magnetic field with a magnitude of 4 7x10 3 T What magnetic force does the proton experience

1 A beam of electrons moving left at 3 x10 7 m s passes at right angles a uniform magnetic field that is 2x10 4 T What force acts upon each electron in the beam Remember the charge on an electron is 1 6 x 10 19C

4 What is the force on a 3 5 m long wire that is carrying a 12 A current if the wire is perpendicular to Earth s magnetic field at a location where the Earth s magnetic field strength is 5 0x10 5 T Express your answer in decimal form

Intensive restitution Monetary restitution Restitution Community service restitution Question 6 What type of institution is a starting place for most inmates and are typically smaller and newer facilities O Medium security facility Maximum security facility Open security facility

0 600 m PK You got a right triangular coil with base of 0 800 m and height 0 600 m having four loops and carrying a current 1 2 00 A Find the magnetic moment u in MKS units O 0 48 A m 1 92 Am 2 04 A m2 0 96 A m 160 0 800 m R

Question 8 A horizontal metal bar oriented east west is dropped straight down at a place where Earth s magnetic field is due north As a result an induced emf develops between the two ends of the bar What would be the direction of the induced potential difference O East to west the west end being at higher potential accumulating positive charges O No answer text provided 1 pts O Neither end carries any excess charge O West to east the west end being at higher potential accumulating more positive charges

The magnitude of the magnetic field 20 cm from a long thin straight wire is 6 2 T What is the current in A through the long wire A

Velma is in a train headed north past Mort at 30 m s Velma has a slingshot that can shoot pebbles at 10 m s Velma shoots a pebble toward the rear of the train Velma observes the pebble s velocity to be a 40 m s north b 20 m s north c 10 m s north d 10 m s south e 20 m s south

2 What are electric forces What are some similarities between electric and magnetic forces

Pre lab Questions 1 What is a magnetic field Where is the magnetic field the strongest

f write down the voltage equations for loops do not solve 4 The voltage equations for Loops is the following g explain do not solve how you would know if the directions of the current you chose in c were correct 1 I know that The directions of the current I choose in C were correct because 2 A single circular loop of conducting wire of radius r 10cm containing a resistor of 15 2 is placed in a region of magnetic field as shown The magnetic field strength B is increased at a constant rate from B 1T to 5T in a time interval of 10s Field O O O O O O O O O O O O OO O O OO a what is the direction of the magnetic field 1 is the direction of the magnetic 2b How many gauss corresponds to 5 1 gauss corresponds to ST 2 c explain why there should be an induced current in the loop 1 There should be an induced current in the Loop because d What is the magnitude and direction of the induced current 4 magnitude of the ind induced current Direction of the induced current Ind Work Shown Below

current of 2A straight wire carrying a a Explain why the current carrying wire is a magnet 1 The current carrying wire is a me magnetic because b Sketch on diagram above some representative magnetic field lines with direction around the wire 1 c Calculate the magnitude direction of the magnetic field produced at point A which is r 10 cm away from the wire 2 magnitude of the magnetic field produced at point A which is r 10cm away from the wire direction of the magnetic field produced at Point A which is r 10cm away from the wire

3 A 2C poi uniform magnetic field of 10T with a velocity of 5 m s at an angle 0 60 a Explain why the point charge experiences a magnetic force when it enters the magnetic field 1 The point charge experiences des a magnetic force when it enters the magnetic field because b Calculate the magnitude and direction of the magnetic force exerted on the point charge 2 magnitude of the magnetic force exerted on the Point charge Direction of the magnet

4 A compass needle aligns in a north south direction because earth s magnetic south pole coincides with its geographic north pole earth s magnetic south pole is reasonably close to its geographic north pole earth s magnetic north pole coincides with its geograpic north pole

Problem 3 Imagine you have a long straight wire running along the x axis Now imagine that centered at x 0 there is a parallel plate capacitor with circular plates of radius a separated by a tiny gap h a with the plates perpendicular to the wire Current I is flowing in the x direction so the capacitor is charging Consider an Ampere s law loop of radius r that is circular and centered on the origin and lying in the y z plane That is the loop is centered in the gap between the plates of the capacitor Using the dE dt term in Maxwell s equations compute the magnetic field magnitude B as a function of r over the range 0 r 3a Plot your result B vs r labeling the value at r 0 and the maximum value Show that at r a you get for B what you would have gotten if you had just used the po I term instead of the dE dt term

A 15 foot ladder is resting against the trunk of a tree The base of the ladder is 12 feet away from the wall when a person starts pushing it towards the wall at a rate of 1 2 st ft How fast is the top of the ladder moving up the tree trunk 6 seconds after the person starts pushing it

The difference when using the first right hand rule for a negative charge the thumb points in the direction opposite to the velocity the fingers point in a direction opposite to the magnetic field there is no change for a negative charge the palm points opposite to the direction of the force

The diagram below represents a wire carrying a current to the right What is the direction of the magnetic field at point C in front of the wire B

If the magnitude of the magnetic field is 2 50 mT at a distance of 11 2 cm from a long straight current carrying wire what is the magnitude of the magnetic field at a distance of 19 6 cr from the wire mT

Base your answer to the following question on the diagram below which represents an electromagnet The arrows indicate the direction of the magnetic field J A K B power hamulion source bedo To ditet tomma di no yalbum A unit oslo erit conti What is the What is the polarity of K fangain and A north B enlw to good south dialdea A 0

Magnetic field is present in region between circles having radii R and 2R B 7t 4 T t in sec How much work in J has to be done to displace a particle having charge q 200 mC from 1 to 2 as shown in figure xx X X X 2 0 0 5 radian R 2m

How fast must a 1 38C charge be moving perpendicular to a 6 12T magnetic field to experience a force of 7 82N 34 7m s 0 0288m s 0 926m s 1 08m s

An object has a mass of 6 32 x 10 3 kg and a charge Q The object is traveling with a velocity of 9 97 x 105 m s North The object enters a magnetic field measured as 0 098 T Down This results in the object experiencing a force found to be 6 14 x 10 N West What is the charge on the object be sure to include the sign Select one O a O b O C d 0 604 mC 62 8 mC 62 8 mC 0 604 mC

A Cessna 182 T has a wingspan of 10 97 m and a cruising speed of 74 7 m s it is flying through a vertical magnetic field with its velocity directed East and a motional emf develops between the northern most and southern most edges of the wings with a value of 0 518 V The northern edge is more positive than the southern edge What is the magnitude and direction of the magnetic field being flown through Select one a O b OC O d 2 36 x 10 3 T Up 6 32 x 10 4 T Up 2 36 x 10 3 T Down 6 32 x 10 4 T Down

18 Select one O a 3 25 A To the Right 13 0 A To the Left 3 25 A To the Left O b O C B A square coil is shown above There is a current flowing in the coil which creates a magnetic moment The external magnetic field B is going to the right as shown The coil starts in the position on the left and then rotates to the position shown on the right The square coil has sides that are 0 250 m long The coil has 313 turns of wire The magnetic field has a magnitude of 66 0 T The torque created is clockwise and has a magnitude of 1 679 x 104 m N What is the magnitude of the current in the coil and as we look at the side of the coil facing us in the left picture is the current going to the right or to the left i B

As shown in the figure below two long parallel wires 1 and 2 carry currents of I 2 76 A and I 4 60 A in the direction indicated y P a Determine the magnitude and direction of the magnetic field at a point midway between the wires d 10 0 cm magnitude UT direction counterclockwise from the x axis b Determine the magnitude and direction of the magnetic field at point P located d 10 0 cm above wire 1

As shown in the figure a small particle of charge q 8 0 10 6 C and mass m 3 1 10 12 kg has velocity v0 9 4 x 10 m s as it enters a region of the uniform magnetic field The particle is observed to travel in the semicircular path shown with a radius R 6 cm Calculate the magnitude and direction of the magnetic field in the region 1 m T VO Region of magnetic field R Path of the particle

10 Explain how resonance can be used as a treatment in medical settings 10 points

20 A hoop is rolling without slipping along a horizontal surface with a forward speed of 5 50 m s when it starts up a ramp that makes an angle of 25 0 with the horizontal What is the speed of the hoop after it has rolled 3 00 m up as measured along the surface of the ramp O 8 02 m s O 1 91 m s 3 79 m s 2 06 m s 4 22 m s

The figure shows a long fixed wire AB carrying constant current I Another wire XY parallel to AB of mass per unit length is kept at a distance r from wire AB connected to a capacitor of capacitance C by flexible light wires through a switch The capacitor is initially charged to voltage E The switch is closed at t 0 and the circuit has a negligible The velocity of the wire XY just after closing the switch will be A Ho CE 4 r B Ho CE 2 r L C C D Ho CE 2 r Ho CE 48 Luo IC B 1 A Y X

bolt earth Prac gpb org physics motion Work each of the following problems SHOW ALL WORK 4 One point charge has a magnitude of 5 4 x 10 7 C A second charge that is 0 25 m away has a magnitude of 1 1 x 10 17 C What is the electric force magnitude of one charge on the other

A long straight very thin wire on the y axis carries a 10 A current in the positive y direction A circular loop 0 50 m in radius also of very thin wire and lying in the yz plane carries a 9 0 A current as shown Point P is on the positive x axis at a distance of 0 50 m from the center of the loop What is the magnetic field vector at point P due to these two currents 0 4 x 10 7 T m A 0 50 m O A 8 0 10 6 Tk 9 0 A 0 50 m O zero O 4 0 10 6 T i 4 0 10 6 T k 4 0 10 6 T i 4 0 10 6 T k 4 0 10 6 T i 8 0 10 6 T k 10 A P y

e coil whose lengthwise cross section is shown in the accompanying figure carri ths indicated Use any variable ymbol stated above along with the following A x D B

A wire carrying a 34 0 A current passes between the poles of a strong magnet The wire is perpendicular to the magnetic field of the magnet and experiences a 2 35 N force on its 3 00 cm length in the field What is the average field strength of the magnet T T

In Newton s law of universal gravitation the force between two masses is proportional to the product of the two masses What plays the role of mass in Coulomb s law OA the electric charge O B the electric dipole O C the electric monopole O D the electric quadruple 1

Consider the figure below which shows a very basic motor or generator There is a rectangular wire loop carrying current that is placed in an external magnetic field Note the south pole of the magnet is on the left Which of the following is are correct for the left segment of wire Choose all that are correct S Brush Rotation axis Rotor Commutator The direction of the force is to the right The direction of the force is into the page The direction of the torque is down the axis of rotation The direction of the torque is out of the page None of these is correct

Suppose that in some region of space there is a magnetic field directed downward that is decreasing in magnitude Which of the following must be true Choose all correct answers There is wire nearby with decreasing current There will be an induced magnetic field to oppose the change There will be an induced electric field in the region of space There will be an induced current None of these must be true

Two coaxial circular coils of radius R 15 cm each carrying 4 0 A in the same direction are positioned a distance d 20 cm apart as shown in the figure Calculate the magnitude of the magnetic field halfway between the coils along the line connecting their centers u0 4 x 10 7 T m A O 0 90 x 10 5 T 6 3 10 5 T 09 2 10 5 T O 3 9 10 5 T 1 9 10 5 T d 0 R

A rigid rectangular loop which measures 0 30 m by 0 40 m carries a current of 5 5 A as shown in the figure A uniform external magnetic field of magnitude 2 9 T in the negative x direction is present Segment CD is in the xz plane and forms a 35 angle with the z axis as shown Find the magnitude of the external torque needed to keep the loop in static equilibrium A 5 5 A D Z 0 30 m 35 O 1 3 N m O 1 4 Nm 0 73 Nm y N m B 0 40 m C B 2 9 T

A rigid circular loop has a radius of 0 20 m and is in the xy plane A clockwise current I is carried by the loop as shown The magnitude of the magnetic moment of the loop is 0 75 A m A uniform external magnetic field B 0 20 T in the positive x direction is present An external torque changes the orientation of the loop from one of lowest potential energy to one of highest potential energy The work done by this external torque is closest to O 0 40 J O 0 30 J 0 50 J 0 20 J 0 20 m a b L B 0 20 T x

Two circular coils of diameter 30 0 cm are parallel to each other and have their centers along the same line L but separated by 22 0 cm When an experimenter views the coils along L the coil closer to her carries a clockwise current of 2 50 A Find the magnitude and sense clockwise or counterclockwise of the current needed in the other coil so that the net magnetic field on L midway between the two coils will have a magnitude of 4 10 T and point away from the experimenter who is viewing the coils along L u04 x 10 7 T m A

A 2.99 x 10-6 C charge is moving perpendicular (90°) to the Earth's magnetic field (5.00 x 10-5 T). If the force on it is 2.14 x 10-8 N, how fast is it moving? [?] m/s

An electric field will be induced in an area where the magnetic field is changing with respect to time. This is: Coulomb's Law Maxwell's Corollary Ohm's Law Faraday's Law

Calculate the magnitude of the force per unit length between two parallel straight conductors 5.0 cm apart, each carrying a current of 4.0 A. [A=5]

A proton moves with an unknown velocity through a magnetic field of 6.79 x 10-4 T that points directly south. The proton experiences a force of 3.45 x 10-16 N directly east. What is the magnitude of the velocity? (charge of a proton is +1.6x 10-19 C) 1.23 x 106 m/s 3.18 x 107 m/s 1.23 x 107 m/s 3.18 x 106 m/s

4. Which of the following must be true for a current to be induced in a wire passing through a magnetic field? the magnetic field and the direction of motion must be perpendicular the magnetic field and direction of motion must be parallel

10. Which of the following are true about magnets? Check all that apply. opposite poles attract opposite poles repel like poles attract like poles repel

A current-carrying wire carries a current of 2.53 A. What is the magnitude of the magnetic field at point P, 0.0034 meters away from the wire? 1.49 x 10-5 T 1.49 x 10-4 T 2.69 x 10-9 T 2.69 x 10-10 T

9. A proton moves with an unknown velocity through a magnetic field of 3.45 x 103 T that points directly north. The proton experiences a force of 2.40 x 10-15 N directly east. What is the magnitude of the velocity? (charge of a proton is +1.6 x 10-1⁹ C) 8.85 x 106 m/s 4.35 x 106 m/s 6.35 x 108 m/s 4.35 x 107 m/s