Electromagnetic Induction

JEE Main level, single correct, medium

38 of 153

Question 38 of 153

Consider a circular coil of wire carrying constant current I,I, forming a magnetic dipole. The magnetic flux through an infinite plane that contains the circular coil and excluding the circular coil area is given by ϕi{\phi }_{i} The magnetic flux through the area of the circular coil area is given by ϕ0{\phi }_{0} . Which of the following option is correct?

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Answer: (D) ϕi=−ϕ0{\phi }_{i}=-{\phi }_{0}

As magnetic field lines always form a closed loop, hence every magnetic field line creating magnetic flux in the inner region must be passing through the outer region. Since flux in two regions are in opposite direction.
∴ϕi=−ϕ0∴{\phi }_{i}=-{\phi }_{0}

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