Electrostatic Potential and Capacitance  MCQs

MCQs of Electrostatic Potential and Capacitance

Showing 61 to 70 out of 141 Questions
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61.
Capacitance of parallel plate capacitor becomes 43 times its original value if a electric slab of thickness t = d2 inserted between the plates. Where d is the separation between plates. The dielectric constant of the slab is _____
(a) 4
(b) 8
(c) 2
(d) 6
Answer:

Option (c)

62.
The potential energy of the system in which one electron is taken away from another electron will _____ .
(a) not change
(b) become zero
(c) increase
(d) decrease
Answer:

Option (d)

63.
Electric charges of +10 μC, +5 μC, -3 μC and 8 μC are placed at the corners of a square of side 2 m. The resultant potential at the centre of the square is _____
(a) 1.8 V
(b) 1.8 x 102 V
(c) 1.8 x 103 V
(d) 1.8 x 105 V
Answer:

Option (d)

64.
Three charges 3 x 10-8 C, 6 x 10-8 C and -2 x 10-8 C are placed at the corner of an equilateral triangle of side 3 m. The resultant electric potential at the centre of the triangle is _____ .
(a) -125 V
(b) -220 V
(c) -450 V
(d) -700 V
Answer:

Option (c)

65.
A unit charge is taken from one point to another on the equipotential surface. The work done in this process will be _____ .
(a) zero
(b) positive
(c) negative
(d) optimum
Answer:

Option (a)

66.
Equipotential surface associated with an electric field, which is increasing in magnitude along the x-direction, are _____
(a) planes parallel to YZ-plane
(b) planes parallel to XY-plane
(c) planes parallel to XZ-plane
(d) co-axial cylinders around the X-axis
Answer:

Option (a)

67.
When 3 Coulomb charge is placed in a uniform electric field, it experiences a force of 3000 newton within this field. Potential difference between two points separated by a distance of 1 cm is _____ .
(a) 10 volt
(b) 90 volt
(c) 1000 volt
(d) 3000 volt
Answer:

Option (a)

68.
The electric potential V at any point (x, y, z) in space is given by V = 4x2 volt. The electric field E in V/m at the point (1, 0, 2) is _____ .
(a) +8 in x direction
(b) 8 in -x direction
(c) 16 in +x direction
(d) 16 in -x direction
Answer:

Option (b)

69.
125 small drops of water, whose charge and radius are same, are joined to make a big drop. The capacity of big drop is _____ times that of small drop.
(a) 5
(b) 8
(c) 16
(d) 64
Answer:

Option (a)

70.
How many 1 μF capacitor must be connected in parallel to store a charge of 1 C with a potential difference of 500 V across the capacitor ?
(a) 1000
(b) 200
(c) 20
(d) 2000
Answer:

Option (d)

Showing 61 to 70 out of 141 Questions
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