4. What direction does the magnetic force exerted on a straight current carrying

Question

4. What direction does the magnetic force exerted on a straight current carrying wire point?

(a) The force will always be perpendicular to the magnetic field and the wire.

(b) The force will always be perpendicular to the magnetic field and parallel to the wire.

(c) The force will always be parallel to the magnetic field and perpendicular to the wire.

(d) The force will always be parallel to the magnetic field and the wire.

5. What is magnetohydrodynamics?

(a) The flow of liquid iron near Earth’s core causes Earth’s magnetic field.

(b) A fluid pump that uses the magnetic force.

(c) A dynamic, time-varying electric field.

(d) The magnetic field produced by water passing through a constricted pipe.

6. When is the torque produced by an electric motor at its peak?

(a) The torque produced by an electric motor is constant.

(b) When the plane of the loop is perpendicular to the magnetic field.

(c) When the plane of the loop makes a 45 degree angle with the magnetic field.

(d) When the plane of the loop is parallel to the magnetic field.

Explanation / Answer

4. Answer - (a)

F = I LxB

So the force is always perpendicular to both magnetic field and current direction/wire.

5. Answer - (a)

The flow of liquid iron near Earth’s core causes Earth’s magnetic field.

6. Answer - (d)

Toque = I AxB

So the torque is maximum when area vector is perpendicular to magnetic field.

So when the plane of the loop is parallel to the magnetic field, the torque is maximum.

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