A circular flat coil that has N turns, encloses an area A, and carries a current i has its central axis parallel to a uniform magnetic field B in which it is immersed.

The net torque on the coil is .

a) iBA

b) NiA

c) NiB

d) NiAB

e) Zero

Torque on the coil will be ZERO

Explanation:

As we know that the magnetic moment of the closed current carrying coil is always along its axis and it is given as

now we know that magnetic field is also along the axis of the coil so here as we know the equation of torque given as

so we have

a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?