A circular coil with a cross-sectional area of 4 cm 2 has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 cm 2 , as shown in the figure. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?
A
7.54 
B
8.54 
C
9.54 
D
10.54 
Text Solution
Verified by ExpertsThe correct answer is:
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Let us refer to the coil as circuit 1 and the solenoid as circuit 2. The field in the central region of the solenoid is uniforms, so the flux through the coil is
Where 
turns/m
The mutual inductance is
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