Physics

Problem

Which of the following gives the magnitude of torque acting on a coil of

N

turns, carrying current

I

and of area

A

, placed in a uniform magnetic field

B

when its plane makes an angle

\phi

with the field? a)

\tau = 2 N I B A \cos \phi

\tau = N I B A \cos \phi

\tau = N I B A \sin \phi

\tau = N I B A