The torque required to hold a small circular coil of 10 turns, area and carrying a current of
in the middle of a long solenoid of
turns/m carrying a current of
, with its axis perpendicular to the axis of the solenoid is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Here, For small circular coil,
Number of turns,
Area,
Current,
For a long solenoid,
Number of turns per meter, per
Current,
Magnetic field due to a long solenoid on its axis is
Magnetic moment of a circular coil is
Torque,
(Using (i) and (ii))
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