A circular coil ‘A’ has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the center of the circular coil are in the ratio of (i.e. 
to 
)
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnetic field in circular coil 
is
Similarly, 
is radius and 
is current flowing in coil.
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