Q165 / 170 · Manipal (MET) 2018 · Physics

A long solenoid of length $L$ has a mean diameter $D$. It has $n$ layers of winding of $N$ turns each. If it carries a current $i$, the , magnetic field at its centre will be

A
proportional to $D$
B
inversely proportional to $D$
Correct answer
C
independent of $D$
D
proportional to $L$

Solution

Magnetic field due to solenoid is independent of diameter (Because $B=\mu_0 n i$ ).

Hence, the correct answer is option: 'C'.

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