Chapter 1: Electrostatics — Online MCQ Test
PHYSICS · CLASS 12th · Tamil Nadu State Board
Practice Chapter 1: Electrostatics with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers electric charges Coulomb law electric fields and Gauss law applications. Students study electric potential potential energy capacitors dielectric polarization a....
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Chapter 1: Electrostatics — Important Questions & Answers
Which of the following is the SI unit of electric charge?
- A. Coulomb
- B. Newton
- C. Volt
- D. Farad
Answer: A. Coulomb
Electric charge is measured in coulomb (C) in the SI system. Newton is a unit of force, volt of potential, and farad of capacitance.
Electric charge is measured in coulomb (C) in the SI system. Newton is a unit of force, volt of potential, and farad of capacitance.
According to Coulomb’s law, the electrostatic force between two point charges is directly proportional to:
- A. The product of the magnitudes of the charges
- B. The sum of the charges
- C. The square of the distance between them
- D. The inverse of the distance between them
Answer: A. The product of the magnitudes of the charges
Coulomb’s law states that force is directly proportional to q1q2 and inversely proportional to the square of the distance between them.
Coulomb’s law states that force is directly proportional to q1q2 and inversely proportional to the square of the distance between them.
Two identical charges +q and +q are separated by distance r. If the distance is doubled, the electrostatic force becomes:
- A. F/2
- B. F/4
- C. 2F
- D. 4F
Answer: B. F/4
From Coulomb’s law, force varies inversely as the square of distance. When distance becomes 2r, the force becomes F/4.
From Coulomb’s law, force varies inversely as the square of distance. When distance becomes 2r, the force becomes F/4.
Which of the following is NOT a property of electrostatic field lines?
- A. They originate from positive charges
- B. They are denser where the field is stronger
- C. They can cross each other
- D. They never form closed loops in electrostatics
Answer: C. They can cross each other
Field lines cannot cross because the electric field at any point has only one direction. If they crossed, the field would have two directions at the same point.
Field lines cannot cross because the electric field at any point has only one direction. If they crossed, the field would have two directions at the same point.
In a Van de Graaff generator, the main purpose of the moving belt is to:
- A. Increase magnetic induction
- B. Transport charge to the hollow sphere
- C. Convert AC into DC
- D. Reduce the potential of the sphere
Answer: B. Transport charge to the hollow sphere
The insulating belt carries charge from the lower comb to the hollow metal sphere. This charge accumulates on the sphere, producing a very high potential.
The insulating belt carries charge from the lower comb to the hollow metal sphere. This charge accumulates on the sphere, producing a very high potential.