Three solenoid coils of same dimension, same number of turns and same number of layers of winding are taken. Coil ${\rm{1}}$ with inductance ${L_1}$ was wound using a ${\rm{Mn}}$ wire of resistance ${\rm{11}}\,\,{\rm{\Omega }}{m^{ - 1}}$;Coil ${\rm{2}}$ with inductance ${L_2}$ was wound using the similar wire but the direction of winding was reversed in each layer; Coil ${\rm{3}}$ with inductance ${L_3}$ was wound using a superconducting wire. The self-inductance of the Coils ${L_1},{L_2},{L_3}$ are

JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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Understanding +4 | -1

Three solenoid coils of same dimension, same number of turns and same number of layers of winding are taken. Coil

\mathrm{1}

with inductance

{L_1}

was wound using a

\mathrm{Mn}

wire of resistance

\mathrm{11}\,\,\mathrm{\Omega }{m^{ - 1}}

;Coil

\mathrm{2}

with inductance

{L_2}

was wound using the similar wire but the direction of winding was reversed in each layer; Coil

\mathrm{3}

with inductance

{L_3}

was wound using a superconducting wire. The self-inductance of the Coils

{L_1},{L_2},{L_3}

are

View answer and explanation

Correct option: C

{L_1}, = {L_3};{L_2} = 0

Option C (

{L_1}, = {L_3};{L_2} = 0

) is correct because reversing the winding direction in coil 2 results in zero net flux, and coils 1 and 3 have the same inductance.