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A solenoid is placed inside another sole...

A solenoid is placed inside another solenoid, the length of both being equal carrying same magnitude of current. The parameters like radius and number of turns are in the ratio 1:2 for the two solenoids. The mutual inductance on each other would be

A

`M_(12)=M_(21)`

B

`M_(12)=2M_(21)`

C

`2M_(12)=M_(21)`

D

`M_(12)=4M_(21)`

Text Solution

Verified by Experts

The correct Answer is:
A
We have, `M=Ksqrt(L_(1)L_(2))`
For perfect coupling, `K=1rArrM_(12)=M_(21)`
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