Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202622 January 2026Morning ShiftPhysicsElectromagnetic InductionActual

Three identical coils C₁, C₂ and C₃ are closely placed such that they share a common axis. C₂ is exactly midway. C₁ carries current I in anti-clockwise direction while C₃ carries current I in clockwise direction. An induced current flows through C₂ will be in clockwise direction when

Options

  1. AC₁ moves away from C₂ and C₃ moves towards C₂
  2. BC₁ and C₃ move with equal speeds away from C₂
  3. CC₁ moves towards C₂ and C₃ moves away from C₂
  4. DC₁ and C₃ move with equal speeds towards C₂

Correct answer

C. C₁ moves towards C₂ and C₃ moves away from C₂

Step-by-step solution

Let the common axis be the z-axis. C₁ is at z = -d , C₂ is at z = 0 , and C₃ is at z = +d . Current in C₁ is anti-clockwise (ACW), producing a magnetic field B₁ in the +z direction at C₂ . Current in C₃ is clockwise (CW), producing a magnetic field B₃ in the -z direction at C₂ . The net magnetic field at C₂ is B_ net = B₁ - B₃ . Since C₁ and C₃ are equidistant and carry equal current, initially B_ net = 0 . To induce a clockwise current in C₂ , Lenz's law states that the induced current must oppose the change in fl

Practice Electromagnetic Induction on Quantrex Academy →

More from Electromagnetic Induction

List-I contains four conducting loops lying in the XY plane, as shown in the figures. The loops are rotating about Z axis passing through the point O with time period T in clockwis 2026A 30 cm long solenoid has 10 turns per cm and area of 5 cm ^2 . The current through the solenoid coil varies from 2 A to 4 A in 3.14 s. The e.m.f. induced in the coil is 10⁻⁵ V. Th 2026A square loop of side 2 cm is placed in a time varying magnetic field with magnitude as B = 0.4 (300t) Tesla. The normal to the plane of loop makes an angle of 60° with the field. 2026An inductor of inductance 10 mH having resistance of 100 , is connected to battery of E.M.F. 1.0 V through a switch as shown in the figure below. After switch is closed, the ratio 2026A metal rod of length L rotates about one end at origin with a uniform angular velocity . The magnetic field radially falls off as B(r) = B₀ e^ - r ; being a positive constant. The 2026A circular loop of radius 20 cm and resistance 2 is placed in a time varying magnetic field B = (2t^2 + 2t + 3) T . At t = 0 , for the plane of the loop being perpendicular to the 2026In the given circuit below inductance values of L₁ , L₂ and L₃ are same. The magnetic energy stored in the entire circuit is (U_t) and that stored in the L₂ inductor is (U_l) . U_t 2026A circular current loop of radius R is placed inside square loop of side length L(L >> R) such that they are co-planar and their centers coincide. The permeability of free space is 2026 Full Electromagnetic Induction list All JEE Main PYQs