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
Answer:

Option (d)

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
Answer:

Option (b)

23.
Consider the earth of radius 6408 km as a spherical conductor, its capacitance is _____
(a) 980μF
(b) 1424μF
(c) 712μF
(d) 600μF
Answer:

Option (c)

24.
What is electric potential at a equatorial point of small dipole having dipole moment P ? (Let r = distance from dipole)
(a) Zero
(b) P4πξ0r2
(c) P4πξ0r3
(d) 2P4πξ0r3
Answer:

Option (a)

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
Answer:

Option (b)

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) q4πξ0a
(b) 2q4πξ0a
(c) 4q4πξ0a
(d) Zero
Answer:

Option (d)

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
Answer:

Option (c)

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
Answer:

Option (c)

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
Answer:

Option (c)

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 Qq is _____
(a) 4
(b) 14
(c) 2
(d) 12
Answer:

Option (b)

Showing 21 to 30 out of 141 Questions