Free Electrostatics MCQs with Answers
831 Electrostatics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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Read the Electrostatics notesFree MDCAT chapter notes with key terms831 questions · page 22 of 42
- A. In parallel
- B. In series
- C. Either way because both combinations have the same capacitance
- D. We can not determine, because presence of resistance in the circuit determines capacitance
Explanation: In series, the net capacitance of the capacitors is less than the individual capacitances.
Correct answer: In series422. Aluminium is _.
- A. An excellent conductor
- B. A semiconductor
- C. An insulator
- D. A photoconductor
Explanation: Option A is correct because aluminum is metal and has free electrons. As metals are conductors so aluminum is a metal and thus an…
Correct answer: An excellent conductor- A. Zero
- B. kq/r2
- C. q/r2
- D. q/ε0
Explanation: Option A is correct because in a charged sphere since all the charges are distributed at the surface, so according to Gauss law the…
Correct answer: Zero- A. 4F
- B. 2F
- C. F
- D. F/2
Explanation: The force between two charges Q and q separated by distance d is given by Coulomb's law as F = (1/4πε₀) (Q*q/d²)where ε₀ is the electric…
Correct answer: 4F- A. To deposit 63% of the equilibrium charge
- B. To deposit 36% of the equilibrium charge
- C. To deposit 63 times of the equilibrium charge
- D. To deposit 36 times of the equilibrium charge
Explanation: The meaning of time constant is the time taken by the capacitor to be charged to about 63.2% of its full value through a resistor…
Correct answer: To deposit 63% of the equilibrium charge- A. V/2
- B. V/q
- C. qV/2
- D. qV
Explanation: The energy acquired by a particle with charge q when accelerated through a potential difference V is given by the formula:U=qVThis is…
Correct answer: qV- A. Difference of the kinetic energy per unit charge
- B. Difference of the kinetic energy
- C. Difference of the potential energy per unit charge
- D. Difference of the potential energy
Explanation: The electric potential difference between two points can be defined as the difference of potential energy per unit charge.Electric…
Correct answer: Difference of the potential energy per unit charge- A. In the direction opposite to the electric field
- B. In the direction of the electric field
- C. In the direction perpendicular to the electric field
- D. In the direction perpendicular to the velocity of charge
Explanation: Assume that a positively charged plate is on the left and a negatively charged plate is on the right.
Correct answer: In the direction opposite to the electric field- A. F/3
- B. F/9
- C. F/3d
- D. F/9d
Explanation: The electrostatic force is given as F = kq1q2/r². So the force between the two charges is inversely proportional to the square of the…
Correct answer: F/9- A. Electromagnetism
- B. Electrostatics
- C. Quantum physics
- D. Magnetism
Explanation: Electrostatics is the branch of physics concerned with the study of stationary electric charges and the electric fields they create.
Correct answer: Electrostatics- A. Electric
- B. Magnetic
- C. Electrostatic
- D. None of above
Explanation: A magnetic field does not do any work on a charged particle thus has no effect on the velocity of a charged particle.
Correct answer: Magnetic432. What is a capacitor?
- A. A device that produces audio sounds
- B. A device that dissipates electric charge
- C. A device that stores electric charge in an electric field
- D. A device that emits radio signals
Explanation: A capacitor is a device that stores electric charges in an electric field.
Correct answer: A device that stores electric charge in an electric field433. If there is a frictional force between two surfaces, then which of the following will be created?
- A. Electric field
- B. Charge
- C. Magnetic field
- D. All of these
Explanation: Friction between two surfaces causes charge separation as electrons are transferred from one material to another.
Correct answer: Charge- A. 4πε(b-a)
- B. (4πεab)/(b-a)
- C. None of these
- D. 4πεab
Explanation: The capacitance of a spherical resistor is given by:C = (4πεab)/(b-a) whereQ= is the charge on the inner sphere.ε = permittivity of free…
Correct answer: (4πεab)/(b-a)- A. Increases by k
- B. Has no effect
- C. Decreases by k
- D. Increases by k/2
Explanation: Introducing a dielectric in a capacitor causes a decrease in the electric field, and hence the voltage.
Correct answer: Increases by k- A. QV/2
- B. CV²/2
- C. Q²/2C
- D. All of these
Explanation: In a capacitor, charge +Q and -Q is stored on one plate each. The potential difference between the plates is V, and the average potential…
Correct answer: All of these- A. 0.5 mJ
- B. 0.05 mJ
- C. 5 mJ
- D. 50 mJ
Explanation: The energy stored in a capacitor can be calculated using the formula:E = (1/2) * C * V2Where,E is the energy storedC is the capacitanceV…
Correct answer: 0.05 mJ- A. kg m s-3 A-1
- B. kg s-2 A-3
- C. kg2 m-2 s-3 A
- D. m s-1 A-3
Explanation: Force-mass x acceleration-kg x ms-2.Q=current(1) x time(t)=IT=A.sE=F/Q-kg ms-2/As .E=kgms-3A-1As it is numerical, it can have only one…
Correct answer: kg m s-3 A-1- A. 4.0 x 10^-3 F
- B. 3.54 x 10^-9 F
- C. 8.85 x 10^-9 F
- D. 9.0 x 10^-9 F
Explanation: The capacitance of a parallel plate capacitor isC=ЄA/dC=(8.85x10^-12)x(2)/(2x10^-3)=8.85 x 10^-9CAs it is numerical, it can have only one…
Correct answer: 8.85 x 10^-9 F- A. 60 μC
- B. 2.4 C
- C. 2.4 μC
- D. 60 C
Explanation: Use formula Q=CV, where C is .005 F and V is 12 V, and then convert the answer to μC by dividing it with 1000.0.005 x 12 / 1000 = 60 μC.
Correct answer: 60 μC