An electric current i is flowing in a circular coil of radius a. At what distant from the centre on the axis of the coil will the magnetic field be 1/8th of its value at the centre –
A
3 a
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
B P = 
,
R = a (given)
8R 3 = (R 2 + x 2 ) 3/2
2R = (R 2 + x 2 ) 1/2
x 2 = 3R 2
x = 
R = 
a
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