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For c = 2a if, the magnetic field at point P will be zero when

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a=b

a=35b

a=53b

a=13b

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detailed solution

Correct option is C

Magnetic field at the centreB=μ0I2c⊗+μ0I2b34⊙+μ0I2a34⊗As per problem:0=μ0I21c−34b+34a⇒341b−1a=1cIf c = 2a,341b−1a=12a⇒a=53b

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