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Q.

Magnetic field at O of a loop of uniform resistance per unit length is

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a

$\frac{\sqrt{2} μ_{0} I}{R}$

b

$\frac{μ_{0} I}{2 R}$

c

$\frac{μ_{0} I}{4 R}$

d

Zero

answer is D.

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Detailed Solution

Field due to straight section will be in equal and opposite direction. Field due to curved section is zero.

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