JEE MAIN - Physics (2020 - 7th January Morning Slot - No. 18)
Consider a circular coil of wire carrying constant current 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 $$\phi $$i. The magnetic flux through the area of the circular coil area is given by $$\phi $$0. Which of the following option is correct?
$$\phi $$i = $$\phi $$0
$$\phi $$i < $$\phi $$0
$$\phi $$i $$>$$ $$\phi $$0
$$\phi $$i = - $$\phi $$0
Explanation
As, magnetic field lines forms a closed loop, hence each line from circular area will pass through outer area
in opposite direction hence $$\phi $$i = - $$\phi $$0.
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