MCQs of Electromagnetic Induction

Electromagnetic Induction MCQs

MCQs of Electromagnetic Induction

Showing 101 to 110 out of 113 Questions

101.

The direction of induced emf during electromagnetic induction is given by _____.

(a)	Faraday's law
(b)	Lenz's law
(c)	Ampere's law
(d)	Maxwell's law

102.

To induce emf in a coil, the magnetic flux linked with a coil _____.

(a)	must decrease
(b)	must increase
(c)	must remain constant
(d)	can either increase or decrease

103.

Unit of magnetic flux density is _____.

(a)	V / sec
(b)	Wb / m²
(c)	Wb / sec
(d)	None of the above

104.

The unit of inductance is equivalent to _____.

(a)	$\frac{Volt ampere}{Second}$
(b)	$\frac{Volt}{Ampere second}$
(c)	$\frac{Volt second}{Ampere}$
(d)	$\frac{Ampere}{Volt second}$

105.

If N is the number of turns in a coil, the value of self inductance varies as ∝ _____.

(a)	N⁰
(b)	N
(c)	$N^{\frac{1}{2}}$
(d)	N²

106.

If number of turns in a coil is increase from 10 to 100, its inductance becomes _____ times the original value.

(a)	10
(b)	100
(c)	$\frac{1}{10}$
(d)	25

107.

Mutual inductance of a system of two coils is 0.3 H. If the current in the one coil is changed from 10 A to 40 A in 0.01 sec, the average induced emf in the other coil is _____ volt.

(a)	9
(b)	900
(c)	9000
(d)	90000

108.

Mutual inductance of a system of two coils is 4 mH. In one coil, current changes with time according to I = sin (50πt). The induced emf in the another coil as a fuction of time is _____ V.

(a)	50π cos (50 πt)
(b)	5π cos (50 πt)
(c)	π cos (50 πt)
(d)	π sin (50 πt)

109.

Current of 2 A passing through a coil of 100 turns gives rise to a magnetic flux of 5 × 10^-5 Wb/turn,the magnetic energy associated with the coil is _____ J.

(a)	5
(b)	5 × 10^-1
(c)	5 × 10^-2
(d)	5 × 10^-3

110.

Current I is flowing through a toroidal solenoid of radius r, length l and area A. If the number of turns of the toroidal solenoid is N, then energy stored in the toroidal solenoid is _____.

(a)	$\frac{1}{2} \frac{μ_{0} N^{2} A}{π r} I^{2}$
(b)	$\frac{1}{8} \frac{μ_{0} N^{2} A}{π r} I^{2}$
(c)	$\frac{1}{6} \frac{μ_{0} N^{2} A}{π r} I^{2}$
(d)	$\frac{1}{4} \frac{μ_{0} N^{2} A}{π r} I^{2}$

Showing 101 to 110 out of 113 Questions