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The strength of the magnetic field at a point y near a long straight current carrying wire is B.

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The strength of the magnetic field at a point y near a long straight current carrying wire is B. The field at a distance y/2 will be _________ 

(a) B/2 

(b) B/4 

(c) 2B 

(d) 4B

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Best answer

The correct option (c) 2B

Explanation:

we know B ∝ (1/r)

As distance y is changed to (y/2) i.e. distance is halved hence by above relation field will be doubled, hence new field = 2B.

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