Indicate true or false in each of the following statements: A) The torque on a c
ID: 3900514 • Letter: I
Question
Indicate true or false in each of the following statements:
A) The torque on a current loop (coil) with fixed current is proportional to the enclosed area of the coil and independent of the shape.
B) A charged particle moving parallel to a uniform B field will move on a spiral path.
C) A + charge initially moving east through the earths magnetic field along the equator will fall faster than if it is moving west.
D) The magnetic field lines enter the north poles of a bar magnet and leave the south poles and are continuous inside the magnet.
E) Two parallel currents repel each other.
Explanation / Answer
a) TRUE - Torque = M.B.sin(theta) where M = current X area. Hence torque is independent of shape.
b) FALSE - Force = q(v X B) = qvBsin(theta) = 0 when charge moves parallel. Thus charge will continue to move in straight line.
c) FALSE - The force on the charged particle will be in upward direction. Thus it will fall slowly.
d) FALSE - Lines of force come out of the magnet from north pole.
e) FALSE - Two parallel currents attract each other.