MCQs of Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 91 to 100 out of 141 Questions

91.

The work done in placing a charge of 8 x 10^-18 C on a capacitor of capacity 100 μF is _____ .

(a)	4 x 10^-10 J
(b)	32 x 10^-32 J
(c)	16 x 10^-32 J
(d)	3.1 x 10^-26 J

92.

Two metallic spheres of radii R₁ and R₂ are charged. Now they are brought into contact with each other with a conducting wire and then are separated. If the electric fields on their surfaces are E₁ and E₂ respectively, E₁ /E₂ = _____

(a)	R₂ / R₁
(b)	R₁/ R₂
(c)	${R_{2}}^{2} / {R_{1}}^{2}$
(d)	${R_{1}}^{2} / {R_{2}}^{2}$

93.

If there are n capacitors in parallel connected to V volt source, then energy stored is equal to _____ .

(a)	CV
(b)	CV²
(c)	$\frac{1}{2 n}$ CV²
(d)	$\frac{1}{2}$ nCV²

94.

A uniform electric field is prevailing in Y-direction in a certain region. The co-ordinates of points A, B and C are (0, 0), (2, 0) and (0, 2) respectively. Which of the following alternatives is true for the potentials at these points ?

(a)	V_A = V_B, V_A > V_C
(b)	V_A > V_B, V_A = V_C
(c)	V_A < V_C, V_B = V_C
(d)	V_A = V_B, V_A < V_C

95.

To increase the charges on the plates of a capacitor means _____ .

(a)	to increase the capacitance of the capacitor
(b)	to increase the potential difference between the plates
(c)	to decrease the potential difference between the plates
(d)	to decrease the capacitance of the capacitor

96.

For a capacitor the distance between two plates is 5x and the electric field between them is E₀. Now a dielectric slab having dielectric constant 3 and thickness x is placed between them in contact with one plate. In this condition what is the p.d. between its two plates ?

(a)	$\frac{13 E_{0} x}{3}$
(b)	$15 E_{0} x$
(c)	$7 E_{0} x$
(d)	$\frac{9 E_{0} x}{2}$

97.

Work done in placing a charge of 8 x 10^-18 C on a capacitor of capacitance 800 μF is _____ .

(a)	3.1 x 10^-26 J
(b)	16 x 10^-32 J
(c)	4 x 10^-32 J
(d)	32 x 10^-32 J

98.

If 20 J of work has to be done to move an electrical charge of 4 C from a point, where potential is 10 volt to another point, where potential is V volt, find the value of V.

(a)	5 volt
(b)	15 volt
(c)	2 volt
(d)	70 volt

99.

64 small drops of water having same charge and same radius are combined to form one big drop. The ratio of capacitance of big drop to small drop is _____ .

(a)	4 : 1
(b)	1 : 4
(c)	2 : 1
(d)	1 : 2

100.

Torque acting on an electric dipole in a uniform electric field is maximum when angle between

\vec{p}

and

\vec{E}

is _____ .

(a)	90°
(b)	180°
(c)	45°
(d)	0°

Showing 91 to 100 out of 141 Questions