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 20 of 42
- A. Electric field and magnetic field
- B. Magnetic field
- C. Electric field
- D. Both a and b
Explanation: A static charge produces an electric field. A moving charge produces a magnetic field.
Correct answer: Electric field- A. 1 coloumb
- B. charge on on alpha particle
- C. charge on one proton
- D. 1 micro coloumb
Explanation: The smallest indivisible unit of charge is one electron, which is equal to charge of one proton.
Correct answer: charge on one proton- A. nonconservative
- B. conservative
- C. depends upon the shape of charge
- D. none of these
Explanation: Work done by the electrostatic force is independent of the path followed by it, and it depends only on the initial and final positions.
Correct answer: conservative- A. E-0
- B. E < mg/q
- C. E = mg/q
- D. E > mg/q
Explanation: The forces on the droplet will be due to gravitational pull (related to mass) and due to the applied electric fieldqE will be directed…
Correct answer: E = mg/q- A. Volt/meter
- B. Newton/meter
- C. Tesla
- D. Coloumb/meter
Explanation: The electric field intensity (volt/meter) at any location is the force (Newton) that would be experienced by a unit test charge (Coulomb)…
Correct answer: Volt/meter- A. 1 / 4(π E)
- B. 4 / (π E)
- C. 4(π E)
- D. π / 4E
Explanation: The following image shows the explanation for this question:
Correct answer: 1 / 4(π E)- A. Δ[V] = Δ[U] - q
- B. Δ[V] = Δ[U]/q
- C. Δ[V] = Δ[U] + q
- D. Δ[V] = Δ[U] x q
Explanation: The electric potential difference, also known as voltage, is the external work needed to bring a charge from one location to another…
Correct answer: Δ[V] = Δ[U]/q- A. Zero
- B. Kq/r2
- C. q/r2
- D. q/e0
Explanation: The electric intensity at the center of a uniformly distributed charge depends on the charge distribution and the geometry of the system.
Correct answer: Zero- A. q2 = 4q1
- B. q2 = 2q1
- C. q2 = 0.5q1
- D. q2 = 0.25q1
Explanation: Formula for E: E = q / 4πɛr2 Since E1 = E2 q1 / 4πɛr12 = q2 / 4πɛr22 q1 / 4πɛr12 = q2 / 4πɛ (2 r1)2 ( r2 = 2r1) q1 / 4πɛr12 = q2 / 16 πɛ…
Correct answer: q2 = 4q1- A. 1.6 x 10^-19 J
- B. 9.6 x 10^-19 J
- C. 9.6 x 10^-18 J
- D. 1.6 x 10^-18 J
Explanation: q = 3eq = 3 (1.6 х 10-19)V = 2V E = qV E = (3 х 1.6 x 10-19)(2V) E = 9.6 x 10-19 JThis is numerical so it can only have one answer so…
Correct answer: 9.6 x 10^-19 J- A. Reduces the electrostatic force
- B. Increases the electrostatic force
- C. Does not change electrostatic force
- D. Doubles the electrostatic force
Explanation: Option: A The presence of a dielectric between the two plates actually decreases the electric field inside the capacitor.
Correct answer: Reduces the electrostatic force- A. F
- B. 2F
- C. F/4
- D. F/8
Explanation: The electrostatic force of attraction or repulsion between to charges is given by Coulomb's Law:F = kq₁q₂/r² ---------- equation 1where,F…
Correct answer: F/8- A. 6.25 x 10^18
- B. 625 x 10^18
- C. 6.023 x 10^23
- D. None of these
Explanation: We can simply find the number of electrons taken out from a body to produce 1 coulomb of charge by using the following formula: Q = ne…
Correct answer: 6.25 x 10^18- A. Two times
- B. Four times
- C. Unchanged
- D. Halved
Explanation: Initially, the force between charges say q1 and q2 seperated with distance r is :F=4πϵ0 1 r2q1 q2 Step 2: New force calculationWhen the…
Correct answer: Unchanged- A. CV
- B. CV^2
- C. ½ CV
- D. ½ CV^2
Explanation: Energy stored in a parallel capacitor is 12 qv, where q =cv so 1/2 cv2.
Correct answer: ½ CV^2- A. Continuous if there is a charge at that point.
- B. Always continuous.
- C. Discontinuous only if there is a negative charge at that point.
- D. Discontinuous only if there is a charge at that point.
Explanation: The electric field caused by any charge will be continuous if there is no other charge in the medium.
Correct answer: Discontinuous only if there is a charge at that point.- A. Electrostatics
- B. Magnetism
- C. Thermal physics
- D. Quantum physics
Explanation: Printers and photocopiers use the phenomena of electrostatics in their working, as a field of positive charges is accumulated on the…
Correct answer: Electrostatics- A. Big charges
- B. Small charges
- C. Point charges
- D. Any charges
Explanation: According to Physics Sindh Textbook pg 40.It clearly states "..... two static point charges....." , i.e the charge is at a single point in…
Correct answer: Point charges- A. It moves in the direction of electric field
- B. It accelerates in the direction of electric field
- C. It moves in the direction opposite to electric field
- D. It accelerates in the direction opposite to electric field
Explanation: The direction of an electric field is from positive to negative. An electron being negatively charged will be attracted to the positive…
Correct answer: It accelerates in the direction opposite to electric field- A. RC
- B. R/C
- C. e^RC
- D. R+C
Explanation: yes because of givThe RC time constant, also called tau, the time constant (in seconds) of an RC circuit, is equal to the product of the…
Correct answer: RC