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An electric current passes through a long straight wire

An electric current passes through a long straight wire. At a distance 5 cm from the wire, the magnetic field is B. The field at 20 cm from the wire would be

Options

(a) B / 6
(b) B / 4
(c) B / 3
(d) B / 2

Correct Answer:

B / 4

Explanation:

No explanation available. Be the first to write the explanation for this question by commenting below.

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