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NEET
Exam
NEET
Subject
Physics
Chapter
Electromagnetic Induction

NEET · Physics · Electromagnetic Induction

Assertion (A) When a circular coil. placed in a region with its...

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.Assertion (A) When a circular coil. placed in a region with its place parallel to a magnetic field, expands radially

Options

  1. ABoth AA and RR are true. RR is correct explanation of AA.
  2. BBoth AA and RR are true. RR is not correct explanation of A\mathrm{A}.
  3. CAA is true, RR is false.
  4. DA is false, RR is true.

Correct answer

C. AA is true, RR is false.

Step-by-step solution

When plane of a coil is parallel to magnetic field, Assertion (A) When a circular coil. placed in a region with its place parallel to a magnetic field, expands radially
Flux linked with coil, ϕB=B⋅A=0(B⊥A=0)\phi_B=\mathbf{B} \cdot \mathbf{A}=0 \quad(\mathbf{B} \perp \mathbf{A}=0) So induced emf is zero. ∴\therefore Assertion A is correct. Reason R\mathrm{R} is incorrect as magnetic field is parallel to the plane of coil.
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