Magnetic Field due to current Questions and Answers

A proton with mass mp 1 67 x 10 27 kg charge qp 1 6 x 10 19 C moving with a speed of 0 80 x 105 m s enters the Earth s magnetic field B 55 0 T Northbound If the proton is shot eastward the magnetic force acting on it should be O 8 08 x 10 16 N downward O 7 04 x 10 19 N downward O 7 04 x 10 19 N West bound O 7 04 x 10 19 N upward

5 A wire 0 50 m long is put into a uniform magnetic field The force exerted upon the wire when the current in the wire is 20 A is 3 0 N Wha is the magnetic field acting upon the wire

13 A 14 32 A current moves through a 0 15 m wire If a magnetic force of 6 62 x10 4 N acts on the wire what is the magnetic field at right angles to the wire Round scientific notation to one decimal place Round decimal form to four decimal places

12 A wire is placed perpendicular to a uniform magnetic field of 4 6x10 4 T A magnetic force of 2 9x10 3 N is exerted on the wire If t current in the wire is 10 0 A how long is the wire Round to nearest hundredth two decimal places

Question 6 1 pts A charged particle after entering a constant magnetic field B starts moving freely along a circular path in the magnetic field applied perpendicular to the particle s velocity v What do you conclude about the particle s kinetic energy KE O KE and magnetic force Fg are not correlated O KE decreases when magnetic force FB is perpendicular to the motion v OKE increases under the constant magnetic force FB

Ms D 0 Question 12 Self inductance L of a 40 0 cm long solenoid containing N 400 turns and cross sectional area of 5 00 x 10 4 m would Take the permeability of free space o 4 x 107 Tm A be O 0 18 mH O 0 44 mH 1 pts O 0 25 mH

An electron with mass mp 9 1x 10 31 kg charge qe 1 6 x 10 1 C moving with a speed of 2 50 x 105 m s enters the Earth s magnetic field B 55 0 T Northbound If the electron moves westward the magnetic force FB acting on it should be O 2 2 x 10 18 N eastward O 2 2 x 10 18 N downward O 7 04 x 10 16 N upward O 2 2 x 10 18 N upward

An electromagnetic wave with a peak magnetic field component of magnitude B 1 5 x 10 7 T has an associated peak electric field component E of O 2 0 x 10 5 N C O 45 N C 22 N C 0 5 x 10 15 N C

Consider a magnetic field B with B 2 20 x 10 4 T in a place on Earth surface directed parallel to Earth s surface pointing north A metal cable attached to a space station stretches radially outwards 2 50 km What would be the potential difference developed between the ends of the cable when travels eastward on Earth at a speed v 6 5 km s O 444 0 V O 400 0 V 1 pts O 3 58 kV

A charged particle q is shot with a velocity v in a straight line parallel to an external magnetic field B through a region of space Therefore assuming that there is no other field present close by we may conclude that the charged particle O experiences zero magnetic field force FB O finds a zero component of B in the direction of its motion experiences a high magnetic force FB due to the field B O encounters no magnetic field B 0

6 A long straight wire carries a current of 3 00 A from left to right A particle of charge 6 50 x 10 6 C is moving parallel to and above the wire The particle is 0 050 m from the wire and is moving at 280 m s from left to right What is the magnitude and direction of the force on the particle

1 What is a magnetic field Where is the magnetic field the strongest

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4 A long straight wire carries a current I 2 55 A from left to right Another long straight wire is located 0 340 m above the first wire The second wire carries a current l 1 00 A from left to right What is the magnetic field magnitude and direction at a point midway between the two wires 1

1 A solenoid has 100 turns and is 0 100 m long A current of 5 00A runs counter clockwise when the solenoid is arranged as in the drawing below If a proton travels across the diameter of the solenoid from left to right at 1 0 x 10 m s what force magnitude and direction does the proton experience m 1 67 x 10 27 kg qp 1 6 x 10 O Solenoid

Areas within ferromagnetic materials where magnetic fields line up are called magnets domains O magnetic fields areas electrons

When a magnet is broken in half The broken North pole becomes a magnetic South monopole Each piece has a North and a South pole The broken North pole becomes a magnetic North monopole Will have both a North and South pole only if it is long enough

second 3 The figure below is a cross sectional view of a coaxial cable The center conductor is surrounded by air a conductor surrounded by air and an outer conductor The current I 1 5 A L 3 5 L 2 A Assuming the distance d 1 00 mm answer the following a Determine the magnitude and direction of the magnetic field at point a ANSWER b Determine the magnitude and direction of the magnetic field at point b ANSWER c Determine the magnitude and direction of the magnetic field at point c ANSWER

2 A wire having a mass per unit length of 1 52 g cm carries a 3 50 A current horizontally to the north as shown in What is the direction of the minimum magnetic field needed to lift this wire vertically upward h What is the magnitude of the minimum magnetic field needed to lift this wire vertically upward W SEYON I

1 mun moves with a velocity of v 4i 3j k m s in a region in which the magnetic field is B 2i j 2k T What is the magnitude of the magnetic force this particle experiences

A circular loop of diameter 10 cm carrying a current of 0 20 A is placed inside a magnetic field 0 30 Tk The normal to the loop is parallel to a unit vector 0 60 0 80 Calculate the magnitude of the torque on the loop due to the magnetic field i i O 0 60 x 10 4 N m zero O 2 8 10 4 N m O 1 2 x 10 4 N m O 4 7 x 10 4 N m

A wire carries a 4 0 A current along the x axis through a magnetic field B 5 0 7 0 T If the wire experiences a force of 30 N k as a result how long is the wire O 1 5 m O 1 1 m 0 87 m O 0 63 m

A doubly charged ion charge 2e with velocity 6 9 x 106 m s moves in a circular path of diameter 60 0 cm in a magnetic field of 0 80 T in a mass spectrometer What is the mass of this ion e 1 60 10 19 C 3 3 10 27 kg O 11 10 27 kg O x 4 5 10 27 kg O 8 2 x 10 27 kg 6 7 x 10 27 kg O O

A wire carrying a current is shaped in the form of a circular loop of radius 3 0 mm If the magnetic field strength that this current produces at the center of the loop is 1 1 mT what is the magnitude of the current that flows through the wire o 4 x 10 7 T m A O 23 A O 16 A 5 3 A O 9 1 A

A round loop of diameter 12 cm carrying a current of 0 40 A is placed inside a magnetic A field B 0 20 Ti 0 40 Ti The normal to the loop is parallel to the unit vector A n 0 60 i 0 80 j What is the potential energy of the loop 2 3 10 3 J 4 5 x 10 3 J O 2 0 10 3 J O 2 0 10 3 J O 4 5 x 10 3 J

A straight wire that is 0 60 m long is carrying a current of 2 0 A It is placed in a uniform magnetic field of strength 0 30 T If the wire experiences a force of 0 18 N what angle does the wire make with respect to the magnetic field 35 25 90 30 60

A wire segment 1 2 m long carries a current I 3 5 A and is oriented as shown in the figure The x axis points directly into the page A uniform magnetic field of magnitude 0 50 T pointing toward the x direction is present as shown What is the magnetic force vector on the wire segment YA B O O O O 30 1 8i 1 1 k N 1 1 1 8 k N 1 11 1 8 k N 1 1 1 8 k N A 1 8i 1 1 k N Z

2 Determine the force on a particle traveling 5 3E7 m s to the west through a magnetic field with a strength of 6 8 T to the east F qvB electrons protons 1 6E 19 C 2 25E27 N 3 604E8 N O 5 77E 11 N F BIL PO V 1 4 Np N

positive There are no other fields of any kind in the region and no forces act on the particle other than magnetic forces Which of the following is are correct Choose all that are correct If the particle is initially moving into the page it will slow down If the particle is initially moving to the right it will speed up If the particle is initially moving into the page it will move in a circle If the particle is initially moving to the right its acceleration will be zero None of these are correct

In the figure shown below there is a wire carrying current to the right What is the direction of the magnetic field at the location of the x 1 X Down toward the bottom of the page Into the page Out of the page Up toward the top of the page None of these is correct

The figure below represents a region of uniform magnetic field B directed into the page If the black dot is a positively charged particle what arrow would represent the particle s velocity at this instant that would result in the maximum force on the particle Rintothe A B C B A A and C would result in a maximum force B would not

The group of arrows in the figure below represents MAGNETIC field lines What is the direction if any of the force on the particle due to the magnetic field if the particle is initially moving into the page and has a net positive charge Up toward the top of the page Down toward the bottom of the page Right Left There is no force due to the field

Problem 6 The current in a long solenoid of radius 3 0 cm and 20 turns cm is varied at a rate dl of di 2 A s dt a Derive the expression for the magnitude of the electric field outside of the solenoid in terms of the number of turn per unit length n radius R the distance from the center of the wire r and the rate of change of the current dl dt

8 The image below represents a ferromagnetic material The areas in which 1 point the arrows representing the magnetic field of each area are called magnets O poles O domains O electrons www www n

An electron moving perpendicular to a uniform magnetic field of 3 2 10 2 T moves in a circle of radius 0 40 cm How fast is this electron moving mel 9 11 10 31 kg e 1 60 10 19 C x O 8 0 106 m s O 3 0 106 m s O 1 9 10 30 m s O 1 9 10 2 m s O 2 2 107 m s

A proton starting from rest travels through a potential of 1 0 kV and then moves into a uniform 0 040 T magnetic field What is the radius of the proton s resulting orbit mproton 1 67 10 27 kg e 1 60 10 19 C O 0 14 m 0 11 m 0 080 m O 0 17 m O 0 19 m

30. You bring the north pole of one magnet close to the south-pole of another magnet. Which of the following is/are true? Check all that apply. The field lines move from the north pole of the one to toward the south pole of the other magnet. There is a repulsive force between the north pole of the one and the south pole of the other. There is an attractive force between the north pole of the one and the south pole of the other. The field lines move from the south pole of the one to toward the north pole of the other magnet.

A current-carrying wire carries a current of 1.20 A. What is the magnitude of the magnetic field at point P, 0.042 meters away from the wire? 7.00 x 10-⁹ T 7.00 x 10-8 T 5.71 x 10-5 T 5.71 x 10-6 T

1. What was Hans Christian Oersted most known for? showing that a magnet created an electric force on a charged particle showing that the direction a current flows if from the positive terminal to the negative terminal showing that the direction of the magnetic field is defined by the right-hand rule showing that a current-carrying wire emitted a magnetic field

1. A charged particle moves in a circle in a magnetic field. What must be true about that particle? the charged particle is moving perpendicularly to a magnetic field the charged particle is moving outside of a magnetic field the charged particle is moving parallel to the magnetic field the charged particle is moving at an angle to the magnetic field

The figure shows three long, parallel current- carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire? A B D C The magnetic force on current 1 is equal to zero.

A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19 C) x 8.2 × 10-27 kg 3.3 × 10-27 kg 6.7 x 10-27 kg 11 x 10-27 kg 4.5 × 10-27 kg x

A long straight conductor has a constant current flowing to the right. A wire rectangle is situated above the wire, and also has a constant current flowing through it (as shown in the figure). Which of the following statements is true? 1 The net magnetic force on the wire rectangle is zero, and the net torque on it is zero. The net magnetic force on the wire rectangle is downward, and there is also a net torque on the it. The net magnetic force on the wire rectangle is downward, and the net torque on it is zero. The net magnetic force on the wire rectangle is zero, but there is a net torque on it. The net magnetic force on the wire rectangle is upward, and there is also a net torque on the it.

An electric current passes through a long straight copper wire. At a distance 5cm from the straight wire, the magnetic field is B. The magnetic field at 20cm from the straight wire would be

7. The diagram below shows the north pole of one bar magnet located near the south pole of another bar magnet. Which choice best describes the magnetic field near these magnets? * N S O the field would be to the right from the north an to the left from the south O The field would be to the left from the north and to the right from the south O The field would be out of the south and toward the north O The field would be out of the north and toward the south

Which factors affect the strength of a magnetic field around a current-carrying wire? Check all that apply. the type of metal of the wire the amount of the current the direction of the current the temperature of the wire the distance from the wire

A long wire carrying 100 A is perpendicular to the magnetic field lines of a uniform field of magnitude 0.0050 T. At what distance from the wire is the net magnetic field zero? At what point in space relative to the wire (up, down, in front of the page, behind the page, left, right) is the net field zero?

A charged particle enters a uniform magnetic field with a velocity v at right angles to the field. It moves in a circle with period T. An identical particle enters the field with a velocity v/2. What is its period? 4T 2T T T/2

Three long straight wires are directed into the page. They each carry equal currents in the directions shown in the figure. The lower two wires are attached to a table. The upper wire is in the middle above them as shown, gravity is acting on it vertically. Is it possible for this wire to "float" so to form a triangle (as shown) with the lower wires? Explain your reasoning in details, showing how you have applied the appropriate physics principle and/or laws.

20. A wire 25 cm long with an north-south orientation carries a current of 3.0 A southward. There is a uniform magnetic field perpendicular to this wire. If the force on the wire is 0.33 N upward, what is the magnitude and direction of the magnetic field? (Note: East-west and north-south are in the page, up-down are perpendicular to the page). a) 0.44 T, Up b) c) 0.0044 T, Up d) 0.44 T, East e) 0.44 T, West 0.0044 T, East