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Physics · Electromagnetic Induction

JEE Main 2026 — 22 January, Morning Shift — Question 43

Three identical coils C1,C2\mathrm{C}_{1}, \mathrm{C}_{2} and C3\mathrm{C}_{3} are closely placed such that they share a common axis. C2\mathrm{C}_{2} is exactly midway. C1\mathrm{C}_{1} carries current II in anti-clockwise direction while C3\mathrm{C}_{3} carries current II in clockwise direction. An induced current flows through C2\mathrm{C}_{2} will be in clockwise direction when

  1. Option A:

    C1\mathrm{C}_{1} and C3\mathrm{C}_{3} move with equal speeds away from C2\mathrm{C}_{2}

  2. Option B:

    C1\mathrm{C}_{1} moves towards C2\mathrm{C}_{2} and C3\mathrm{C}_{3} moves away from C2\mathrm{C}_{2}

    Correct
  3. Option C:

    C1\mathrm{C}_{1} moves away from C2\mathrm{C}_{2} and C3\mathrm{C}_{3} moves towards C2\mathrm{C}_{2}

  4. Option D:

    C1C_{1} and C3C_{3} move with equal speeds towards C2C_{2}

Answer: B

Step-by-step solution

Magnetic field through the coil is

B⃗=(BC2−BC1)i^ϕ=(BC2−BC1)Aε=−dϕdt\begin{aligned} \vec{B} & =\left(B_{C_{2}}-B_{C_{1}}\right) \hat{i} \phi & =\left(B_{C_{2}}-B_{C_{1}}\right) A \varepsilon & =\frac{-d \phi}{d t} \end{aligned}

Find the direction according to Lenz's law If coil move away then magnetic field decreases & vice versa

Solution figure

Answer key and solution verified before publishing.

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Exam
JEE Main 2026
Paper
22 January, Morning Shift
Subject
Physics
Chapter
Electromagnetic Induction
Topic
Self-Inductance and Mutual Inductance and Energy Density

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