Magnetic Effects of Current and Magnetism: JEE Main 2020 Physics question

JEE Main 2020 · 9 Jan, Morning shift · Q7659

JEE Main 20209 Jan, Morning shiftPhysicsMediumMagnetic Effects of Current and Magnetism165× since 2002

A long, straight wire of radius a carries a current distributed uniformly over its cross-section. The ratio of the magnetic fields due to the wire at distance

{a \over 3}

and 2

a

, respectively from the axis of the wire is :