Questions
The resistances of three parts of a circular loop are as shown in figure. The magnetic field at the center ‘O’ is (current enters at A and leaves at B and C as shown)
a
μ0i6a
b
μ0i3a
c
23μ0ia
d
zero
detailed solution
Correct option is D
No current will flow through section BC as the potential points B and C are same. Therefore magnetic field at center ‘O’ will be equal and opposite due to section AB and AC. Hence, they cancel out.Talk to our academic expert!
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