MCQs of Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 11 to 20 out of 141 Questions

11.

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

12.

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

13.

The distance between electric charges QC and 9 QC 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

14.

If a capacitor having capacitance of 600 μF is charged at a uniform rate of 50

\frac{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

15.

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

\frac{E_{1}}{E_{2}}

= _____

(a)	$\frac{R_{2}}{R_{1}}$
(b)	$\frac{R_{1}}{R_{2}}$
(c)	$\frac{{R_{2}}^{2}}{{R_{1}}^{2}}$
(d)	$\frac{{R_{1}}^{2}}{{R_{2}}^{2}}$

16.

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 E₀x
(c)	7 E₀x
(d)	$\frac{9 E_{0} x}{2}$

17.

The SI unit of line integration of electric field is _____

(a)	Vm^-1
(b)	C
(c)	NC^-1
(d)	$\frac{N m}{C}$

18.

Which one of the following is not a unit of electric potential ?

(a)	JC^-1
(b)	V
(c)	W
(d)	NmC^-1

19.

The radius of the solid metallic sphere and the hollow metallic sphere is same. If they brought in equipotential region then _____

(a)	The charge on hollow metallic sphere is more
(b)	Both having same charge on them
(c)	The charge on solid metallic sphere is more
(d)	The charges cannot exist on them

20.

The electric potential due to a point electric dipole varies as _____ .

(a)	$\frac{1}{r}$
(b)	$\frac{1}{r^{2}}$
(c)	$\frac{1}{r^{3}}$
(d)	$r^{2}$

Showing 11 to 20 out of 141 Questions