The magnetic field at the center of a circular coil carrying current I ampere is B. If the coil is bent into smaller circular coil of 2n turns, then its magnetic field at the center is B'. The ratio between B' and B is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Magnetic field at the center of circular coil,
… .(i)
Now magnetic field at the center of smaller circular coil,
From Eq. (i), we get
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