A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be
Text Solution
Verified by ExpertsThe correct answer is:
B
The circumference of the first loop is the length of the wire 
The magnetic field at the center of this wire 
The same wire is bent into 
circular coils.
Thus new radius is found out by
Thus magnetic field at the center of these loops 
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