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  4. Choose the correct sketch of the magnetic field lines of a circular current loop shown by the dot ⨀ and the cross ⨂.

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Q. Choose the correct sketch of the magnetic field lines of a circular current loop shown by the dot ⨀ and the cross ⨂.

JEE MainJEE Main 2013Moving Charges and Magnetism

Solution:

If magnetic field is perpendicular and into the plane of the paper, it is represented by cross $\otimes$ and if the direction of the magnetic field is perpendicular out of the plane of the paper it is represented by dot ⨀.