MCQ of Electrostatics Class 12. We covered all the MCQ of Electrostatics Class 12 in this post for free so that you can practice well for the exam.
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MCQ on Electrostatics for Class 12th Students
The distance between H and CI ions in the HCl molecule is 1.28 Å. What will be the potential due to this dipole at a distance of 16 Å on the axis of the dipole?
(A) 0.072 V
(B) 6.4 V
(C) 16 V
(D) 0.8 V
Option a – 0.072 V
At a point in space, the electric field points south. In the region surrounding this point, the rate of change of potential will be zero along ………
(A) North
(B) south
(C) north-south
(D) east-west
Option d – east-west
Two charges 4 μC and 4 µC are placed at points P and Q, 8 cm apart. An equipotential surface of the system
(A) is a sphere of radius 8 cm, where the center is at the midpoint of PQ.
(B) is the perpendicular bisector plane of PQ.
(C) are an ellipse of a major axis of 16 cm and a minor axis of 8 cm centered at the mid-point of PQ.
(D) doesn’t exist.
Option b – is the perpendicular bisector plane of PQ.
If three charges are placed at the vertices of an equilateral triangle of charge 2 µC each. What is the net potential energy, if the side of an equilateral triangle is 4 cm?
(A) 0.9 J
(B) 1.8 J
(C) 2.7 J
(D) 3.6 J
Option c – 2.7 J
A conductor with a negative charge
(A) is always at +ve potential.
(B) is always at zero potential.
(C) is always at negative potential.
(D) maybe at +ve, zero, or -ve potential.
Option d – maybe at +ve, zero, or -ve potential.
If the electric field is given by E-6x+2y+32, then the electric flux through a surface of area 240 units lying in the x – y plane is
(A) 600 units
(B) 240 units
(C) 720 units
(D) 480 units
Option c – 720 units
The kinetic energy of a charged particle decreases by 20 J as it moves from a point at potential 150 V to a point at potential 250 V. Find the charge on the particle
(A) 0.1 C
(B) 0.2 C
(C) 0.4 C
(D) 0.5 C
Option b – 0.2 C
The S.I. unit of electric flux is
(A) amperex second
(B) newton per coulomb
(C) volt x metre
(D) joule per coulomb
Option c – volt x metre
Small drops of the same size are charged to 15 volts each. If 8 drops coalesce to form a single large drop, its potential will be
(A) 15 V
(B) 30 V
(C) 60 V
(D) 120 V
Option c – 60 V
A charge of 20 µC is placed at the center of a spherical shell of radius 10 cm. What will be the work done in moving a charge of +1 µC on its surface through a distance of 4 cm?
(A) 5 J
(B) 0
(C) 0.2 J
(D) Data insufficient
Option b – 0
Assertion: At any point inside a charged conducting sphere, the electrostatic potential remains constant. Reason: At any point inside a charged conducting sphere, electric intensity is zero.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is True.
Option a – The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
In a hydrogen atom, the electron and the proton are bound together at a separation of about 0.53 Å. If the zero of potential energy is taken at an infinite separation of the electron from the proton, the potential energy of the electron-proton system is
(A) – 54.4 eV
(B) – 27.2 eV
(C) – 13.6 eV
(D) zero
Option b – – 27.2 eV
The electric potential V at any point O (x, y, z all in meter) in space is given by V = 3.5x² volt. The electric field at the point (1 m, 0, 2 m) in volt/meter is
(A) 7 along the negative X – axis
(B) 7 along the positive X – axis
(C) 14 along the negative Z-axis
(D) 14 along the positive Z-axis
Option a – 7 along the negative X – axis
We covered all the MCQ of electrostatics class 12 above in this post for free so that you can practice well for the exam.
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