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Question

Current i is flowing in a circular coil of radius a, then magnetic induction at centre is B. If the current is doubled then magnetic induction will be

A
2B
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B
B
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C
4B
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D
22
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Solution

The correct option is D 2B
The magnetic induction in a circular coil of radius a, carrying current i, is
B=μ0i2a
If the current is doubled,
B=μ0(2i)2a
B=2μ0i2a or
B=2B

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