The ratio of magnetic field at the centre of a current carrying circular coil to its magnetic moment is 
. If the current and the radius both are doubled. The new ratio will become
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Magnetic field at the centre of a circular current carrying coil,
and magnetic moment, 
Given that, 
When radius is doubled, the new radius is, 
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