The magnetic field at the center of a current carrying circular loop of radius 
is 
. The magnetic field at a distance 
on its axis from the centre is 
.
A
4
B
2
C
D
8
Text Solution
Verified by ExpertsThe correct answer is:
B
The magnetic field at the center of a circular loop is 
.
On the axis at distance 
from center: 
.
At 
.
The ratio: 
.
Therefore: 
.
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