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Toroid

How does doub...

Question

How does doubling number of turns in a toroidal coil affect the value of magnetic flux density ?

A

Four times

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B

Eight times

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C

Half

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D

Double

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Solution

The correct option is D Double
Magnetic field due to a toroidal coil of radius r having n turns and carrying a current i is given by:
$B = μ_{0} n i / 2 π r$ . So B is proportional to n. If we doubled the number of turns then the field will be also doubled.

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