The ratio of the magnetic field at center of a current carrying coil of the radius a and at a distance a from centre of the coil to the axis of coil is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Magnetic field at the center of a current carrying coil having current I and radius a is given as
… (i)
Magnetic field on the axis of circular current carrying coil of radius a and current I at a distance x from the center is given as
= a
… (ii)
From Eqs. (i) and (ii), we get
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