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  4. A long cylindrical wire of radius R carries a uniform current I flowing through it. The variation of magnetic field with distance ‘r’ from the axis of the wire is shown by

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Q. A long cylindrical wire of radius $R$ carries a uniform current $I$ flowing through it. The variation of magnetic field with distance ‘$r$’ from the axis of the wire is shown by

KCETKCET 2020Moving Charges and Magnetism

Solution:

The magnetic field increases as the point moves closer to the boundary of the wire and decreases as it moves away from the boundary of the wire.