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 21 of 42
- A. 1.6 x 10^-19 C
- B. 9 x 10^9 C
- C. 9.1 x 10^-31 C
- D. 1.6 x 10^-27 C
Explanation: The minimum charge on an object is 1.6×10^-19 C
Correct answer: 1.6 x 10^-19 C- A. Direction
- B. Magnitude
- C. Both direction and magnitude
- D. Neither direction and magnitude
Explanation: As the charges have opposite signs , so only direction changes but magnitude of point charges remain constant.
Correct answer: Magnitude- A. 3/2 N/C
- B. 2/3 N/C
- C. 1/2 N/C
- D. None of these
Explanation: E = F/q F = 2 N , q = 3 C So , electric field = 2N / 3C
Correct answer: 2/3 N/C- A. Charges
- B. System of units and nature of medium
- C. The distance between charges
- D. Nature of medium
Explanation: K depends on •System of units •Nature of medium separating charges
Correct answer: System of units and nature of medium- A. It increases
- B. It decreases
- C. It remains same
- D. It depends on the size or shape of the conductors
Explanation: Option C is correct because to double the charge; you will need to increase the area of plates so that it holds more charge.Thus charge…
Correct answer: It remains same- A. 3q
- B. 2q
- C. 4q
- D. 5q
Explanation: Using Coulomb's law,F = kq1q2/r2In order to make the net force on q 0, both +3 and Q shall exert equal forces.Or For +3 on q = F of Q on…
Correct answer: 3q- A. Remains same
- B. Two times
- C. Four times
- D. Three times
Explanation: C is correct.Energy = CV2/2E∝ V2E' ∝ (2V)2E' ∝ 4V2E' ∝ 4 (V2)E' ∝ 4 E
Correct answer: Four times- A. 1.6
- B. 1.06
- C. 1.006
- D. 1.0006
Explanation: Option D is correct since it is the actual value for the dielectric constant of air.
Correct answer: 1.0006- A. Vx E=0
- B. V.E=0
- C. (VxE)xE=0
- D. V.|E|2=0
Explanation: Option A is correct since under static conditions, the tangential component of the electric field is always zero on the surface and the…
Correct answer: Vx E=0- A. a plane infinite sheet of charge
- B. A point charge
- C. Electric dipole
- D. Line charge of infinite length
Explanation: Option A is correct since there is no relation of the electric field of an infinite plane sheet of charge with distance according to the…
Correct answer: a plane infinite sheet of charge- A. Direction
- B. Magnitude
- C. Both direction and magnitude
- D. Neither direction and magnitude
Explanation: As the negative charge is moving along a straight path towards the positive charge the direction of the charge does not change and hence…
Correct answer: Direction- A. Volt/meter or Newton/coulomb
- B. Volt/meter or meter/coulomb
- C. Volt/coulomb or newton/coulomb
- D. Joule/meter or newton/coulomb
Explanation: The two units of electric intensity are volts per meter (V/m) and newtons per coulomb (N/C).
Correct answer: Volt/meter or Newton/coulomb- A. 2.0 x 10^-2 eV
- B. 2.0 x 10^-3 eV
- C. 2.0 x 10^2 eV
- D. 2.0 x 10^3 eV
Explanation: Energy (in eV) = Charge (in electron charges) × Potential difference (in volts)Given that the charge of the particle is 20 electrons and…
Correct answer: 2.0 x 10^3 eV- A. Parabolic
- B. Circular
- C. Parallel to v
- D. Parallel to E
Explanation: As v and E are not parallel so v and e must be perpendicular. When a charged particle enters an electric field with velocity v, it follows…
Correct answer: Parabolic- A. E = εo / σ
- B. E = σ + εo
- C. E = σ/εo
- D. E = σεo
Explanation: It is the third application of Gauss's law.The electric field intensity (E) between two oppositely charged plates is directly proportional…
Correct answer: E = σ/εo- A. 6.25 x 10^18 electrons
- B. One electron
- C. One proton
- D. 1.6 x 10^19 electrons
Explanation: Remember that 1 coulomb charge is carried by 6.25 × 1018 electrons.
Correct answer: 6.25 x 10^18 electrons- A. Converge towards
- B. Diverge away from
- C. Remain equispaced with
- D. None of these
Explanation: Option B is correct since the electric field lines from a point charge diverge away from each other.
Correct answer: Diverge away from- A. qE
- B. -qE
- C. qE2
- D. -qE-2
Explanation: Option A is correct since an electric field exerts a force on charged particles.
Correct answer: qE- A. 6 eV
- B. 1.5 eV
- C. 0.66 eV
- D. 12 eV
Explanation: Option A is correct since electric potential (V) is defined as the potential energy per unit charge(q).Potential energy= Vq3e x 2v = 6eV
Correct answer: 6 eV- 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