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A long solenoid has a length and mean diameter D. It has n layers of windings each N turns. The magnetic field at the centre is directly proportional to

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a

D

b

L

c

D⁰

d

$\frac{1}{D}$

answer is C.

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Detailed Solution

for a long solenoid B at the center is $μ_{0} ni$ which is independent of diameter.

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