A circular loop of radius r is carrying current I A. The ratio of magnetic field at the center of circular loop and at a distance r from the center of the loop on its axis is:
A
1 : 3 
B
3 
: 2
: 2
C
2 
: 1
: 1
D
1 : 
Text Solution
Verified by ExpertsThe correct answer is:
C
Magnetic field due to current carrying circular loop on its axis is given as
At center, x = 0, 
At x = r, B 2 = 
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