Magnetic field due to currentHard
Question
A long straight wire of radius ′a′ caries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at 
and 2a is
and 2a isOptions
A.
B.4
C.1
D.
Solution
B1 =
......(i)B22π(2a) = μ0i
B2 =
......(ii)
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