Question

A conductor of 3 m length is moving perpendicular to its length as well as a magnetic field of 10^-3 T with a speed of 10^2 m/s,
then the force required to move it with this constant speed is
(1) 0.3 N
(2) 0.9 N
(3) Zero
(4) 3 x 10^-3N​

Answer 1

According to the question;

I=0

Therefore,

F=0

Thus,

No force is exerted on the conductor in the magnetic field.

Thus,

No external field is required to move the conductor at constant speed.

Answer 2

Explanation:

current is ZERO

bcoz it is a rod. Current flows in a complete loop.

And bcoz it is a rod and not a complete loop ..therefore current zero

F=BIL ..Hence force is also zero