AP EAMCET · PHYSICS · Electromagnetic Induction
A coil has 1000 turns and \(500 \mathrm{~cm}^2\) as its area. The plane of the coil is placed at right angles to a magnetic induction field of \(2 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2\). The coil is rotated through \(180^{\circ}\) in \(0.2 \mathrm{~s}\). The average emf induced in the coil, in \(\mathrm{mV}\), is
- A (a) 5
- B 10
- C 15
- D 20
Answer & Solution
Correct Answer
(B) 10
Step-by-step Solution
Detailed explanation
\(N=1000, A=500 \mathrm{~cm}^2=500 \times 10^{-4}\) \(=5 \times 10^{-2} \mathrm{~m}^2\) \(B=2 \times 10^{-5} \mathrm{~Wb} / \mathrm{m}^2, \theta_1=0^{\circ}\), \(\theta_2=180^{\circ}, \Delta t=0.2 \mathrm{~s}\) Initial flux linked with coil, \(\phi_1=N B A \cos \theta_1\)…
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