Ch2 - L3 Magnetic force, Magnetic torque and dipole moment

The diagram shows a section of wire that has been positioned parallel to a uniform 0.1 T magnetic field. The wire carries a current of 2 A. What is the direction of the force acting on the wire due to the magnetic field?

• Out of the screen

• Down the screen

• There is no force acting on the wire.

• Up the screen

What is the direction of the force acting on the wire due to the magnetic field?

• Out of the screen

• Into the screen

• There is no force acting on the wire.

• To the right

• 0.46 T

• 37.33 T

• 1.34 T

• 0.37 T

• 12.68 N

• 4.43 N

• 0.23 N

• 5.65 N

Two wires that have the same length and carry the same current are aligned in the same magnetic flux as shown in the figure below. Which of the following statements is true about the magnitudes of the magnetic force on them?

• There is not enough information to determine the answer.

A coil of 30 turns has an area of 0.005 m² and carries a 4 A current. What is the magnetic dipole moment of this coil?

• 0.02 A⋅m²

• 0.04 A⋅m²

• 0.6 A⋅m²

• 26.7 A⋅m²

If the torque acting on a current-carrying coil whose plane makes a 60∘ angle with a uniform magnetic field is 4 N⋅m, then the maximum value of torque that can act on the coil is

• 2 N⋅m

• 3.5 N⋅m

• 8 N⋅m

• 4.6 N⋅m

A coil of 𝑁 number of turns that has an area of 0.005 m² and carries a current of 4 A is placed in a magnetic field of density 3 T.If the maximum torque that acts on the coil is 6 N⋅m,what is the number of turns of the coil?

• 100 turns

• 25 turns

• 45 turns

• 400 turns

A circular loop with a 24 cm diameter and a resistance of 15 Ω is connected to a battery with an emf of 9 V and negligible internal resistance. Calculate the magnetic dipole moment of this coil.

• 0.075 A⋅m²

• 0.027 A⋅m²

• 6.107 A⋅m²

• 0.075 A⋅m²

For a current-carrying coil in a uniform magnetic field, the angle between the coil’s plane and the direction of the magnetic field that results in no torque acting on the coil equals

• 45

• 0

• 90

• 60