Two wires are bent (shown as joint-circle) with radius r (in xy plane). The upper half as resistance of 2RΩ and the lower half of R Ω. A current I is passed into circle as shown. The magnetic field at centre is:
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a
μ0Ir(k^)
b
μ0I2r(k^)
c
zero
d
μ0I12r(k^)
answer is D.
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Detailed Solution
Magnetic field at centre,BC=μ04r2I3-I3=μ0I12routward so direction is along k^.