The magnetic induction due to short bar magnet on its axial line at a distance 'd' is 'B'. What is the magnetic induction due to the same bar magnet on the same line at a distance d4?
A
16B
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B
32B
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C
64B
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D
128B
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Solution
The correct option is C 64B B=μ02M4πd3 At d4 distance, B′=μ02M4π(d/4)3 =μ02M4πd3×64=64B