What is the magnitude of magnetic field at the centre O of loop of radius2 m made of uniform wire when a current of 1 A enters in the loop and is taken out of it by two long wires as shown in figure?
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a
μ0π1-12T
b
μ02π1-12T
c
zero
d
None of these
answer is C.
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Detailed Solution
Since length NWP is 3 times that of NQP, so resistance of NWP is 3 times that of NQP Hence I1I2=13Net field due to I1 and I2 at centre O will be zero. Field at O due to MN will be same as that due to PQ, but in opposite direction, so net field at centre will be zero.
What is the magnitude of magnetic field at the centre O of loop of radius2 m made of uniform wire when a current of 1 A enters in the loop and is taken out of it by two long wires as shown in figure?