Engineer & Medical

Electromagnetic Induction question bank (Physics)

Practice 1,060 free Engineer & Medical Physics - Electromagnetic Induction questions with answers and step-by-step solutions.

Q1.

A coil of area A and N turns is rotating with angular velocity \(\omega\) in a uniform magnetic field \(\vec{B}\) about an axis perpendicular to \(\vec{B}\). Magnetic flux \(\varphi\) and induced \(\operatorname{emf} \varepsilon\) across it, at an instant when \(\vec{B}\) is parallel to the plane of coil, are :

(A)
\(\varphi=\mathrm{AB}, \varepsilon=0\)
(B)
\(\varphi=0, \varepsilon=0\)
(C)
\(\varphi=0, \varepsilon=\mathrm{NAB} \omega\)
(D)
\(\varphi=\mathrm{AB}, \varepsilon=\mathrm{NAB} \omega\)
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Q2.

Regarding self-inductance: A. The self-inductance of the coil depends on its geometry. B. Self-inductance does not depend on the permeability of the medium. C. Self-induced e.m.f. opposes any change in the current in a circuit. D. Self-inductance is electromagnetic analogue of mass in mechanics. E. Work needs to be done against self-induced e.m.f. in establishing the current. Choose the correct answer from the options given below:

(A)
$\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{E}$ only
(B)
B, C, D, E only
(C)
$\mathrm{A}, \mathrm{C}, \mathrm{D}, \mathrm{E}$ only
(D)
A, B, C, D only
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