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Question

Physics Question on Magnetic Field

The magnetic field inside a toroidal solenoid of radius R is B. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same magnetic field produced by it will be :

A

4B4B

B

2B2B

C

B2\frac{B}{2}

D

B4\frac{B}{4}

Answer

2B2B

Explanation

Solution

Magnetic field is given by μ0nl\mu_0\, nl. Here / is doubled and n is unchanged.