MCQs of Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 81 to 90 out of 141 Questions

81.

A parallel plate capacitor is charged and then isolated. Now a dielectric slab is introduced in it. Which of the following quantities will remain constant ?

(a)	Electric charge Q
(b)	Potential difference V
(c)	Capacitance C
(d)	Energy U.

82.

A moving electron approaches another electron. What will happen to the potential energy of this system ?

(a)	will remain constant
(b)	will increase
(c)	will decrease
(d)	may increase or decrease

83.

Energy of a charged capacitor is U. Now it is removed from a battery and then is connected to another identical uncharged capacitor in parallel. What will be the energy of each capacitor now ?

(a)	$\frac{3 U}{2}$
(b)	U
(c)	$\frac{U}{4}$
(d)	$\frac{U}{2}$

84.

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

85.

The capacitance of a parallel plate capacitor formed by the circular plates of diameter 4.0 cm is equal to the capacitance of a sphere of diameter 200 cm. Find the distance between two plates.

(a)	2 × 10^-4 m
(b)	1 × 10^-4 m
(c)	3 × 10^-4 m
(d)	4 × 10^-4 m

86.

The capacitance of a variable capacitor joined with a battery of 100 V is changed from 2 μF to 10 μF. What is the change in the energy stored in it ?

(a)	2 × 10^-2 J
(b)	2.5 × 10^-2 J
(c)	6.5 × 10^-2 J
(d)	4 × 10^-2 J

87.

A parallel plate capacitor is charged with a battery, and then separated from it. Now if the distance between its two plates is increased, What will be the changes in electric charge, potential difference and capacitance respectively ?

(a)	remains constant, decreases, decreases
(b)	increases, decreases, decreases
(c)	remains constant, decreases, increases
(d)	remains constant, increases, decreases

88.

6 identical capacitors are joined in parallel and are charged with a battery of 10 V. Now the battery is removed and they are joined in series with each other. In this condition what would be the potential difference between the free plates in the combination ?

(a)	10 V
(b)	30 V
(c)	60 V
(d)	$\frac{10}{6} V$

89.

The distance between electric charge Q C and 9Q C is 4 m. What is the electric potential at a point on the line joining them where the electric field is zero ?

(a)	4 kQ V
(b)	10 kQ V
(c)	2 kQ V
(d)	2.5 kQ V

90.

If a capacitor having capacitance of 600 μF is charged at a uniform rate of 50 μC /s, What is the time required to increase its potential by 10 volts.

(a)	500 s
(b)	6000 s
(c)	12 s
(d)	120 s

Showing 81 to 90 out of 141 Questions