Important MCQ’s on Electro statistics

Important MCQ's on Electro statistics

Important MCQ's on Electro statistics

Electrostatics is the study of stationary electric charges. An example of electrostatics is when a plastic rod is rubbed with the fur or silk, it will start to attract tiny pieces of paper and the rod is said to be electrically charged. The charge acquired by the plastic rod is negative and the paper is positive.

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Following are the characteristics of electric charge:

  • Like charges repel each other while unlike charges attract each other.
  • A charge is conserved.
  • All the charges are governed by Coulomb’s law.

Here are some important NEET MCQs (Multiple Choice Questions) on the topic of “Electrostatics” along with their answers:

1. Two point charges, +Q and -2Q, are placed 1 meter apart. The electric field at a point midway between them is zero. What is the ratio of +Q to -2Q?
a) 2:1
b) 1:2
c) 1:4
d) 4:1
Answer: b) 1:2

2. Two equal positive charges are placed 1 meter apart in a vacuum. If the force between them is F, what will be the force if the distance between them is halved?
a) F/4
b) F/2
c) F
d) 2F
Answer: d) 2F

3. A positively charged particle moves in the direction of an electric field. What can you say about the work done by the electric field on the particle?
a) Positive
b) Negative
c) Zero
d) Cannot be determined
Answer: b) Negative

4. A parallel-plate capacitor is connected to a battery. What will happen to the electric field between the plates if the separation distance between the plates is increased?
a) It decreases
b) It increases
c) It remains the same
d) It becomes zero
Answer: a) It decreases

5. Two point charges, +Q and -Q, are placed at a distance of 2r apart. At what point between them will the electric field be zero?
a) At the midpoint
b) At 3r/2 from +Q
c) At r from +Q
d) At 2r/3 from -Q
Answer: b) At 3r/2 from +Q

NEET physics

6.Two point charges, +Q and -Q, are placed 1 meter apart in a vacuum. What is the electric field at the midpoint between the charges? (a) Zero

(b) Q/4πε₀

(c) Q/2πε₀

(d) Q/πε₀

Answer: (a) Zero

7.Two equal positive charges are placed 1 meter apart in a vacuum. What is the net force between them?

(a) Zero

(b) kQ²

(c) 2kQ²

(d) 4kQ²

Answer: (b) kQ², where k is the electrostatic constant.

8.A conductor has a net charge of +3 µC. What is the magnitude of the charge on an isolated region of the conductor?

(a) +3 µC

(b) -3 µC

(c) 0 µC

(d) Cannot be determined

Answer: (c) 0 µC. The charge resides on the surface of a conductor in electrostatic equilibrium, and the electric field inside the conductor is zero.

9.Two point charges, +Q and +4Q, are placed 2 meters apart in a vacuum. At what point on the line joining the charges is the electric field zero?

(a) At the midpoint

(b) At a point 1 meter away from the +Q charge

(c) At a point 1 meter away from the +4Q charge

(d) At a point 0.5 meters away from the +Q charge

Answer: (b) At a point 1 meter away from the +Q charge. The electric field due to the +Q charge cancels the electric field due to the +4Q charge at that point.

10.A charge q is placed at the center of a cube. What is the net electric flux through one of the faces of the cube?

(a) q/ε₀

(b) q/6ε₀

(c) q/2ε₀

(d) q/4ε₀

Answer: (d) q/4ε₀. By Gauss’s law, the net electric flux through a closed surface enclosing a charge q is q/ε₀. In this case, the closed surface is the cube, and each face contributes 1/4th of the total flux.

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