CUET · PHYSICS · PYQ PAPER 2024
A conducting ring of radius r in a magnetic field varying at rate x has electric field intensity at any ring point as :
- A rx
- B rx/2
- C 2rx
- D 4rx
Answer & Solution
Correct Answer
(B) rx/2
Step-by-step Solution
Detailed explanation
\(\oint \vec{E} \cdot d\vec{l} = -\frac{d\Phi_B}{dt}\) \(E \cdot (2\pi r) = -\frac{d}{dt}(B \cdot \pi r^2)\) \(E \cdot (2\pi r) = -x \cdot \pi r^2\) \(E = \frac{xr^2}{2r}\) \(E = \frac{rx}{2}\)
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