MCQs of Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 101 to 110 out of 141 Questions

101.

The potential energy of system of two equal negative point charges of 2 μC, each held 1 m apart in air, is _____ . (k = 9 x 10⁹ SI units)

(a)	3.6 J
(b)	36 J
(c)	3.6 x 10^-2 J
(d)	36 x 10^-3 J

102.

A parallel plate capacitor having air as dielectric medium is charged by a potential difference of V volt. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulated handle. As a result, potential difference between the plates _____ .

(a)	becomes zero
(b)	increases
(c)	decreases
(d)	does not change

103.

Two capacitors of capacitance 2 μF and 4 μF respectively are connected in series. The combination is connected across a potential difference of 10 V. The ratio of energies stored by capacitors will be _____ .

(a)	1 : 4
(b)	1 : $\sqrt{2}$
(c)	4 : 1
(d)	2 : 1

104.

Out of the two copper spheres of the same size, x is hollow while y is solid. If they are charged at same potential, what can be said about the charges on them ?

(a)	Sphere x will have more charge.
(b)	Sphere y will have more charge.
(c)	Charge on both the spheres is equal.
(d)	Charge on both the spheres is zero.

105.

Two plates are 20 cm apart and the potential difference between them is 10 volts. The electric field between the plates is _____ .

(a)	20 V m^-1
(b)	0.5 V m^-1
(c)	500 V m^-1
(d)	50 V m^-1

106.

The unit of physical quantity obtained by the line integral of electric field is _____ .

(a)	N C^-1
(b)	V m^-1
(c)	J C^-1
(d)	C² N^-1 m^-2

107.

Charge of 5 μC and 10 μC are placed 1 m apart. Work done to bring these charges at a distance 0.5 m, from each other is _____ . (k = 9 x 10⁹ SI)

(a)	9 x 10⁴ J
(b)	18 x 10⁴ J
(c)	45 x 10^-2 J
(d)	9 x 10^-1 J

108.

A hollow metal sphere of radius 10 cm is charged such that potential on its surface becomes 80 volt. The potential at the centre of the sphere is _____ .

(a)	80 volt
(b)	800 volt
(c)	8 volt
(d)	zero

109.

What is the dimensional formula of intensity of polarization ?

(a)	M⁰ L¹ T¹ A¹
(b)	M⁰ L² T¹ A¹
(c)	M⁰ L^-2 T¹ A¹
(d)	M⁰ L² T² A²

110.

If electric potential at a point (x, y, z) m in the field is given by equation V = 5x² volt, then electric field at a point (1, 2, 3) m is

\vec{E}

= _____ N/C.

(a)	-10 $\hat{i}$
(b)	-30 $\hat{k}$
(c)	-20 $\hat{j}$
(d)	$\hat{i} + 2 \hat{j} + 3 \hat{k}$

Showing 101 to 110 out of 141 Questions