, carrying
a current of 4.0 A, is suspended through its centre allowing it to turn in a
horizontal plane.
(a) What is the magnetic moment associated
with the solenoid?
(b) What is the force and torque on the
solenoid if a uniform horizontal magnetic field of 
is
set up at an angle of 
with the
axis of the solenoid?
Answer:
(a) Using 
we get
Direction of M is as per sense of current
using the right handed rule.
(b) Torque, 
Force is zero because of uniform field.
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