MCQs of Electrostatic Potential and Capacitance

Electrostatic Potential and Capacitance MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 21 to 30 out of 141 Questions

21.

The distance between two charges 1μC and 3μC is 8 cm. The potential at the mid point of line joining, these both charges are _____ (k = 9 x 10⁹ SI)

(a)	9 x 10²
(b)	9 x 10³
(c)	9 x 10⁴
(d)	9 x 10⁵

22.

The sphere of radius r and R having charge q and Q respectively on them. When they are jointed with conducting wire, the energy of this system does not dissipated then _____

(a)	qr = QR
(b)	qR = Qr
(c)	qr² = QR²
(d)	qR² = Qr²

23.

Consider the earth of radius 6408 km as a spherical conductor, its capacitance is _____

(a)	980μF
(b)	1424μF
(c)	712μF
(d)	600μF

24.

What is electric potential at a equatorial point of small dipole having dipole moment P ? (Let r = distance from dipole)

(a)	Zero
(b)	$\frac{P}{4 {πξ}_{0} r^{2}}$
(c)	$\frac{P}{4 {πξ}_{0} r^{3}}$
(d)	$\frac{2 P}{4 {πξ}_{0} r^{3}}$

25.

Can potential of a charged body be zero ?

(a)	Yes, always
(b)	Yes, but not always
(c)	Never
(d)	Depends on the type of charge

26.

Four charges +q, +q, -q and -q are situated at the four corners of a square length 'a' of each side, then potential at its centre will be _____

(a)	$\frac{q}{4 {πξ}_{0} a}$
(b)	$\frac{2 q}{4 {πξ}_{0} a}$
(c)	$\frac{4 q}{4 {πξ}_{0} a}$
(d)	Zero

27.

Potential is given by V = (5x²+10x-9) V where x is in meter, then the electric field at, x = 2 m is _____ Vm^-1

(a)	21
(b)	22
(c)	-30
(d)	30

28.

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

(a)	2
(b)	20
(c)	200
(d)	0.5

29.

A hollow metallic sphere of radius 10 cm given a charge of 3.2 x 10^-9 C. The electric potential at a point 4 cm from the centre is _____

(a)	Zero
(b)	288 x 10^-9cm
(c)	28.8 x 10^-9V
(d)	9 x 10^-9V

30.

Three charges -q, Q and -q at equal distance on a straight line. If the potential energy of such a system is zero, then the value of

\frac{Q}{q}

is _____

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

Showing 21 to 30 out of 141 Questions