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Question

The magnetic fiux density at a point distance d from long straight current carrying conductor is B, then its value at distance d2 will be-

A
4B
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B
2B
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C
B2
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D
B4
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Solution

The correct option is B 2B
Given: Magnetic field B
Solution: As we know,
B=μ0i2πd
where, i is the current flowing in the wire,
d is the distance from the wire and,
μ0 is the permittivity constant.
Substituting the value of d as d2
we get, Bd2=2B
Hence, the correct option is (B).

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