Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETPhysicsElectromagnetic Induction

Assertion (A) When a circular coil. placed in a region with its place parallel to a magnetic field, expands radially outwards, no emf is induced in it. Reason (R) There is a constant magnet field in the perpendicular (to the plane of the coil) direction.

Options

  1. ABoth A and R are true. R is correct explanation of A .
  2. BBoth A and R are true. R is not correct explanation of A .
  3. CA is true, R is false.
  4. DA is false, R is true.

Correct answer

C. A is true, R is false.

Step-by-step solution

When plane of a coil is parallel to magnetic field, Flux linked with coil, _B= B A =0 ( B A =0) So induced emf is zero. Assertion A is correct. Reason R is incorrect as magnetic field is parallel to the plane of coil.

Practice Electromagnetic Induction on Quantrex Academy →

More from Electromagnetic Induction

A square loop of area A is moving out of the uniform magnetic field (B) with constant velocity v . The EMF (e) induced in the loop is 2026The value of mutual inductance of two coils is 6 mH. The current in one of the coil changes from 7 A to 2 A in 0.2 second, so that e.m.f. is induced in the other coil. If the resis 2026Two identical inductors are connected in parallel. If the parallel combination stores 40 J of magnetic field energy when a total current of 2 A is passed through it, the value of t 2026Two coils have mutual inductance of 0.004 H . The current changes in the first coil according to the relation i = i₀ t , where i₀ = 6 A and = 100 rad/s . The maximum value of emf i 2026The coefficient of coupling is 0.8 . If the mutual inductance is 8 H , then the values of self-inductances L₁ and L₂ of the coil are 2026The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as 2026A wire of length 1 m is moving at a speed of 2 m/s perpendicular to its length in a homogeneous magnetic field of 0.5 T . If the ends of the wire are joined to a circuit of resista 2026Semicircular wire of radius R is rotated in a uniform magnetic field about an axis passing through its ends. If the frequency of rotation is f, the amplitude of induced e.m.f. in t 2026 Full Electromagnetic Induction list All NEET PYQs