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Q.

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

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a

B6

b

B4

c

B3

d

B2

answer is B.

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Detailed Solution

B=10−7 2ir ⇒  BB' = 205  ⇒  B' =B/4
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