MCQs of Electromagnetic Induction

Electromagnetic Induction MCQs

MCQs of Electromagnetic Induction

Showing 81 to 90 out of 113 Questions

81.

The phenomenon in which electric current is induced in conductor by varying magnetic field is called _____ .

(a)	Magnetic Induction
(b)	Electric Induction
(c)	Electro-Magnetic Induction
(d)	Induced emf

82.

X and Y, two metallic coils are arranged in such a way that, when steady change in current flowing in X coil is 4 A, change in metallic flux associated with coil Y is 0.4 Wb. Mutual inductance of the system of these coils is _____ H.

(a)	0.8
(b)	0.1
(c)	0.2
(d)	5

83.

Magnetic flux linked with a coil is Φ = 5t² + 2t + 3, where t is in second and Φ is in weber. At time t = 1 s, the value of induced emf is _____ volt.

(a)	12
(b)	14
(c)	6
(d)	1.2

84.

Magnetic flux of 10 μ Wb is linked with a coil, when a current of 2 mA flows through it. What is the self inductance of the coil?

(a)	10 mH
(b)	5 mH
(c)	15 mH
(d)	20 mH

85.

What is the self-inductance of a solenoid of length 31.4 cm, area of cross section 10^-3 m² and total number of turns 10³ ?

(a)	4 mH
(b)	4 H
(c)	40 H
(d)	0.4 H

86.

Resistance of a coil of cross sectional area 25 cm² and having number of turns 20 is 10 Ω . If the rate of change of magnetic field linked perpendicular to the area of coil is 100 T/s, then current through the coil is _____.

(a)	1 A
(b)	50 A
(c)	0.5 A
(d)	5 A

87.

A magnetic flux of 5 microweber is linked with a coil when current of 1 mA flows through it. What is the self inductance of the coil?

(a)	5 × 10^-3 H
(b)	5 × 10³ H
(c)	2 × 10² H
(d)	2 × 10^-2 H

88.

If the magnetic flux linked with each turn of coil having 60 turns, varies at the rate of 1 Wb/hour, then induced emf is _____ volt.

(a)	0
(b)	$\frac{1}{60}$
(c)	1
(d)	$\frac{1}{3600}$

89.

A conducting loop of radius r is placed concentric with another loop of a much larger radius R, so that both the loops are coplanar. The mutual inductance of the system of the two loops is proportional to _____.

(a)	$\frac{r}{R}$
(b)	$\frac{r}{R^{2}}$
(c)	$\frac{r^{2}}{R}$
(d)	$\frac{r^{2}}{R^{2}}$

90.

A conducting coil having 500 turns has cross sectional area 0.15 m². A magnetic field of strength 0.2 T linked perpendicular to this area changes to 1.0 T in 0.4 sec. The induced emf produced in the coil will be _____ volt.

(a)	10.0
(b)	75.0
(c)	15.0
(d)	150.0

Showing 81 to 90 out of 113 Questions