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 10 of 42
- A. weber meter2
- B. weber
- C. weber/meter
- D. weber/meter4
Explanation: The SI unit of magnetic flux is the Weber (Wb).The formula of magnetic flux:Where:- is the magnetic flux,- is the magnetic field…
Correct answer: weber- A. 8J
- B. 16J
- C. 4 x 10^-3 J
- D. 2 x 10^-3 J
Explanation: Correct. The energy stored in a capacitor is given by \( \frac{1}{2} CV^2 \)In summary, the correct option is **b.
Correct answer: 16J- A. 1.6 x 10^-4
- B. 1.6 x 10^-8
- C. 1.6 x 10^-10
- D. 1.6 x 10^-11
Explanation: Correct. The force on an electron in an electric field of 10^8 N/C is approximately 1.6 x 10^-11 N. In summary, the correct option is **d.
Correct answer: 1.6 x 10^-11- A. -q
- B. +q
- C. -2q
- D. +4q
Explanation: Correct. For the net force on q to be zero, Q must be equal to +4qIn summary, the correct option is **d. +4q** for the charge Q
Correct answer: +4q- A. F = (1/k)(q1q2/r^2)
- B. F = (k)(q1q2/r^2)
- C. F = 4π€(q1q2/r^2)
- D. F = (k)(r^2/q1q2)
Explanation: Coulomb's law states that the electrostatic force between two point charges is given by the product of the magnitudes of the charges…
Correct answer: F = (k)(q1q2/r^2)- A. 240 NC^(-1)
- B. 24 NC^(-1)
- C. 2.4 NC^(-1)
- D. 2400 NC^(-1)
Explanation: The potential gradient (electric field) between two charged plates is calculated by dividing the potential difference (voltage) by the…
Correct answer: 2.4 NC^(-1)- A. Potential gradient
- B. Electric potential energy
- C. Electric intensity
- D. Electric flux
Explanation: The rate of change of electric potential with respect to displacement is known as the potential gradient, which represents the electric…
Correct answer: Potential gradient- A. 32 x 10⁻¹³ N
- B. 0.32 x 10⁻¹³ N
- C. 0.032 x 10⁻¹³ N
- D. 3.2 x 10⁻¹³ N
Explanation: First, find the electric field E = V/d = 10⁴ V / 0.005 m = 2 x 10⁶ V/m.
Correct answer: 3.2 x 10⁻¹³ N- A. It's path is circular in a plane perpendicular to the plane of the magnetic field
- B. The speed and kinetic energy of the particle do not remain constant
- C. The velocity and momentum of the particle change in direction and magnitude
- D. The time period of revolution, angular frequency, and frequency of revolution are independent of the path of the particle and radius of the circular path
Explanation: A charged particle moving perpendicular to the field experiences a force always prependicular to it's motion causing it to move in a…
Correct answer: It's path is circular in a plane perpendicular to the plane of the magnetic field- A. A resultant force and torque
- B. Only force
- C. Only torque
- D. All of these are correct
Explanation: In a non-uniform field, the forces on the two ends of the dipole will not be equal and opposite, resulting in a net force.
Correct answer: A resultant force and torque- A. q/ε₀
- B. Zero
- C. 2q/ε₀
- D. 8πr² q/ε₀
Explanation: According to Gauss's Law, the total electric flux through a closed surface is proportional to the net charge enclosed.
Correct answer: Zero- A. 9.8 x 10⁷
- B. 9.8 x 10⁵
- C. 9.8 x 10³
- D. 9.8 x 10¹
Explanation: For the coin to float, the electric force (Fₑ = qE) must balance the gravitational force ( F₉= mg).
Correct answer: 9.8 x 10⁷- A. The mass of each body remains unchanged.
- B. Mass of each body changes marginally.
- C. Mass of each body changes slightly and hence the total mass.
- D. Mass of each body changes slightly but the total mass remains the same.
Explanation: Charging by rubbing involves the transfer of electrons, which have a very small mass.
Correct answer: Mass of each body changes slightly but the total mass remains the same.- A. The forces acting on them will be equal
- B. Their accelerations may be equal
- C. They may experience different motion in the field
- D. Magnitude of acceleration will be different
Explanation: The neutron (no charge) feels no force. The proton and electron feel forces of equal magnitude but opposite direction.
Correct answer: Magnitude of acceleration will be different- A. Zero
- B. 3kQ/2R
- C. kQ/R
- D. 2kQ/R
Explanation: When connected by a wire, charge will flow until the potential is equal everywhere.
Correct answer: Zero- A. Is attracted towards high voltage plate and stays there
- B. Hangs without moving
- C. Swings backward and forward hitting each plate in turn
- D. Is attracted to earthed plate and stays there
Explanation: The neutral ball is first attracted to the high voltage plate via induction.
Correct answer: Swings backward and forward hitting each plate in turn- A. Increases
- B. Decreases
- C. Remains unchanged
- D. Depending upon temperature
Explanation: If the plates of a capacitor are made larger, they can hold more charge, and if the plates are moved closer together, the electric field…
Correct answer: Increases- A. 2.5 Volts
- B. 2.6 Volts
- C. 2.7 Volts
- D. 2.8 Volts
Explanation: The potential at the first point (where the charge is located) is infinite.
Correct answer: 2.7 Volts- A. 20
- B. 0.5
- C. 2
- D. 5
Explanation: The capacitance with a dielectric is C' = kC, where C is the initial capacitance and k is the dielectric constant.
Correct answer: 20- A. Depends on the maximum surface area of the capacitor plate
- B. Depends on the maximum resistance offered by the circuit
- C. Depends on the maximum electric field the dielectric can withstand
- D. Depends on the maximum current passing through the capacitor
Explanation: The energy stored in a capacitor is limited by the breakdown voltage of its dielectric material.
Correct answer: Depends on the maximum electric field the dielectric can withstand