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The figure shows a long coaxial cable in...

The figure shows a long coaxial cable in which a current I flows down through the inner cylinder of radius a and the same current flows back up through the outer cylinder of radius 2a. The cylinders are insulated from each other and the current is uniformly distributed over the area of the cross-section in each cylinder. The strength of the magnetic field at a distance `3a//2` from the axis of the cable is

A

`B=(5mu_(0)I)/(36pia)`

B

`B=(5mu_(0)I)/(12pia)`

C

`B=(7mu_(0)I)/(12pia)`

D

`B=(7mu_(0)I)/(36pia)`

Text Solution

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The correct Answer is:
D
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