AP EAMCET · PHYSICS · Electromagnetic 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.
- A Both \(A\) and \(R\) are true. \(R\) is correct explanation of \(A\).
- B Both \(A\) and \(R\) are true. \(R\) is not correct explanation of \(\mathrm{A}\).
- C \(A\) is true, \(R\) is false.
- D A is false, \(R\) is true.
Answer & Solution
Correct Answer
(C) \(A\) is true, \(R\) is false.
Step-by-step Solution
Detailed explanation
When plane of a coil is parallel to magnetic field, Flux linked with coil, \(\phi_B=\mathbf{B} \cdot \mathbf{A}=0 \quad(\mathbf{B} \perp \mathbf{A}=0)\) So induced emf is zero. \(\therefore\) Assertion A is correct. Reason \(\mathrm{R}\) is incorrect as magnetic field is…
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