A loop of flexible conducting wire lies in a magnetic field of 
with its plane perpendicular to the field. The length of the wire is 
. When a current of 
is passed through the loop, it opens into a circle, then the tension developed in the wire is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Let the tension developed is 
.
Let radius of loop be 
.
For smaller element
is small 
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