The fractional change in the magnetic field intensity at a distance 'r' from centre on the axis of current carrying coil of radius 'a' to the magnetic field intensity at the centre of the same coil is: (Take r < a)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
[True only if r<<a]
fractional change in magnetic field=
[True only if r<<a]
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