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Self Induction

The magnetic ...

Question

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

AB

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B

2B

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C

B/2

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D

B/4

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Solution

The correct option is B
2B

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