A magnetic needle suspended parallel to a magnetic field requires of work to turn it through 60°. The torque needed to maintain the needle in this position will be:
3 J
--------------------- (i)
The Torgue on the needle is
in magnetic
-----------------(ii)
from equ (i) and ii)
=
Option 1)
3 J
This option is correct.
Option 2)
This option is incorrect.
Option 3)
This option is incorrect.
Option 4)
This option is incorrect.