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A solenoid of length 'l' has N turns of ...

A solenoid of length 'l' has N turns of wire closely spaced, each turn carrying a current i. If R is cross sectional radius of the solenoid, the magnetic induction at 'P'(only axial component).

A

`(mu_0 I N)/2 sqrt(R^2 +I^2))`

B

`(mu_0 iN )/( 2 sqrt(I^2 +4R^2))`

C

`(mu_0 Ni)/( 2 R^2 +I^2)`

D

`(mu_0 Ni)/( 4 sqrt(R^2 +I^2))`

Text Solution

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The correct Answer is:
A
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