Magnetic Field due to current Questions and Answers

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

A proton enters with a velocity between the plates of a capacitor as shown in the figure. What is the direction of the magnetic field needed so that the proton continues its trajectory, undeflected? Explain each step of your reasoning.

The magnetic field inside a superconducting solenoid is 4.71T. The solenoid has an inner diameter of 6.49cm and a length of 25.0cm. a) Determine the magnetic energy density in the field. b) Calculate the energy stored in the magnetic field within the solenoid.