A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the center of the loop is 
It is then bent into a circular coil of 
turns. The magnetic field at the centre of this coil of 
turns will be
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Let 
be the length of the wire.
Magnetic field at the center of the loop is
(i)
(ii)
From eqns. (i) and (ii), we get 
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