The torque required to hold a small circular coil of 10 turns, area 
and carrying a current of 
in middle of a long solenoid of 
turns 
carrying a current of 2.5 A , 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,
Current, 
For a long solenoid
Number of turns per metre, 
per m
Current, 
Magnetic field due to a long solenoid on its axis is
Magnetic moment of a circular coil is,
Torque, 
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