Three identical coils $\mathrm{C}_{1}, \mathrm{C}_{2}$ and $\mathrm{C}_{3}$ are closely placed such that they share a common axis. $\mathrm{C}_{2}$ is exactly midway. $\mathrm{C}_{1}$ carries current $I$ in anti-clockwise direction while $\mathrm{C}_{3}$ carries current $I$ in clockwise direction. An induced current flows through $\mathrm{C}_{2}$ will be in clockwise direction when

(B) $\mathrm{C}_{1}$ moves towards $\mathrm{C}_{2}$ and $\mathrm{C}_{3}$ moves away from $\mathrm{C}_{2}$

(A) $\mathrm{C}_{1}$ and $\mathrm{C}_{3}$ move with equal speeds away from $\mathrm{C}_{2}$

(C) $\mathrm{C}_{1}$ moves away from $\mathrm{C}_{2}$ and $\mathrm{C}_{3}$ moves towards $\mathrm{C}_{2}$

(D) $C_{1}$ and $C_{3}$ move with equal speeds towards $C_{2}$

JEE Main · 2026 · 22 Jan 2026 · Shift 1 · Electromagnetic Induction

Three identical coils

C_{1}, C_{2}

and

C_{3}

are closely placed such that they share a common axis.

C_{2}

is exactly midway.

C_{1}

carries current

I

in anti-clockwise direction while

C_{3}

carries current

I

in clockwise direction. An induced current flows through

C_{2}

will be in clockwise direction when

Answer: (B)

Because

C_{1}

and

C_{3}

carry oppositely-sensed currents, their axial fields at

C_{2}

point in opposite directions, so the net flux through

C_{2}

is governed by

B_{C_{1}} - B_{C_{3}}

. A clockwise induced current in

C_{2}

opposes a growth of this net flux, which requires

B_{C_{1}}

to increase and

B_{C_{3}}

to decrease. That happens when

C_{1}

approaches

C_{2}

while

C_{3}

recedes from it. Hence the induced current in

C_{2}

is clockwise when

C_{1}

moves towards

C_{2}

and

C_{3}

moves away from

C_{2}

JEE Main · 2026 · 22 Jan 2026 · Shift 1 · Single correct option