A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B' , at radial distances a/2 and 2a respectively from the axis of the wire is:

Question:

A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B’ , at radial distances a/2 and 2a respectively from the axis of the wire is:

Options :

(a)1/4
(b)1/2
(c)1
(d)4

Answer :

Answer Steps :

step 1:

step 2:

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