An insulated wire is wound so that it forms a flat coil with N=200 turns. The radius of the innermost turn is r₁=3 cm, and of the outermost turn r₂=6 cm. If 20 mA current flows in it then the magnetic moment will be α×10⁻² A.m ². The value of α is _ _ _.

Magnetic Effects of Current and Magnetism: JEE Main 2026 Physics question

JEE Main 2026 · 4 Apr, Morning shift · Q41

JEE Main 20264 Apr, Morning shiftPhysicsMediumMagnetic Effects of Current and Magnetism165× since 2002

An insulated wire is wound so that it forms a flat coil with

N=200

turns. The radius of the innermost turn is

r_1=3

cm, and of the outermost turn

r_2=6

cm. If 20 mA current flows in it then the magnetic moment will be

\alpha\times10^{-2}

A.m

^2

. The value of

\alpha

is ______.

JEE Main 2026 Magnetic Effects of Current and Magnetism Question with Solution (4 Apr Morning shift, Q41) | JEE Arc