MCQs of Electric Charges and Electric Fields

Electric Charges and Electric Fields MCQs

MCQs of Electric Charges and Electric Fields

Showing 61 to 70 out of 141 Questions

61.

When a 10 μC charge is enclosed by a closed surface, the flux passing through the surface is Φ. Now another -10 μC charge is placed inside the closed surface, then the flux passing through the surface is _____.

(a)	2Φ
(b)	Φ
(c)	4Φ
(d)	zero

62.

An electric dipole is placed at the centre of a sphere. The flux passing through the surface of the sphere is _____.

(a)	Infinity
(b)	zero
(c)	can not be found
(d)	$\frac{2 q}{ε_{0}}$

63.

Two spheres carrying charge q are hanging from a same point of suspension with the help of threads of length 1 m, in a space free from gravity. The distance between them will _____.

(a)	0
(b)	0.5
(c)	2 m
(d)	can not be determined.

64.

One point electric charge Q is placed at P. A closed surface is placed near the point P. The electrical total flux passing through a surface of the sphere will be

(a)	$Q ε_{0}$
(b)	$\frac{ε_{0}}{Q}$
(c)	$\frac{Q}{ε_{0}}$
(d)	zero

65.

Charge Q is placed on (n-1) corners of a polygon of sides n. The distance of each corner from the centre of the polygon is r. The electric field at its centre is _____

(a)	$k \frac{Q}{r^{2}}$
(b)	$(n - 1) k \frac{Q}{r^{2}}$
(c)	$\frac{n}{n - 1} k \frac{Q}{r^{2}}$
(d)	$\frac{n - 1}{n} k \frac{Q}{r^{2}}$

66.

When two spheres having 2Q and -Q charge are placed at a certain distance, the force acting between them is F. Now they are connected by a conducting wire and again separated from each other. How much force will act between them if the separation now is the same as before ?

(a)	F
(b)	$\frac{F}{2}$
(c)	$\frac{F}{4}$
(d)	$\frac{F}{8}$

67.

The number of electric field of lines emerged out from 1 C charge is ______(ε₀ = 8.85 × 10^-12 MKS)

(a)	9 × 10⁹
(b)	8.85 × 10²
(c)	1.13 × 10¹¹
(d)	infinite

68.

When 10¹⁹ electrons are removed from a neutral metal plate through some process, the charge on it becomes ______.

(a)	-1.6 C
(b)	+1.6 C
(c)	10⁹ C
(d)	10^-19 C

69.

A charge Q is placed at the centre of a cube. The electric flux emerging from any one surface of the cube is _____.

(a)	$\frac{Q}{ε_{0}}$
(b)	$\frac{Q}{2 ε_{0}}$
(c)	$\frac{Q}{4 ε_{0}}$
(d)	$\frac{Q}{6 ε_{0}}$

70.

The liquid drop of mass m has a charge q. What should be the magnitude of electric field E to balance this drop ?

(a)	$\frac{mg}{q}$
(b)	$\frac{E}{m}$
(c)	mgq
(d)	$\frac{mq}{g}$

Showing 61 to 70 out of 141 Questions