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 9 of 42
161. If the potential difference across a conductor is doubled, the rate of heat production will become
- A. double
- B. 2^1/2 times
- C. half
- D. four times
Explanation: The rate of heat production (power) in a conductor is given by P=V^2/R , where V is the potential difference and R is the resistance.
Correct answer: four times- A. dry battery
- B. nickel-cadmium battery
- C. head & tail of an eel
- D. transformer
Explanation: Transformers are devices that can step up or step down voltages. By using a transformer, it's possible to obtain 600V from a different…
Correct answer: transformer- A. both positive and negative charges are present
- B. equal quantities of both positive and negative charges are present
- C. an electric dipole exists
- D. no electric field line passes
Explanation: The neutral zone is the region where the electric field lines of two similar charges cancel each other out, resulting in no net electric…
Correct answer: no electric field line passes- A. 5/3V
- B. 3/5V
- C. 7/3V
- D. 3/7V
Explanation: We can use the formula for the electric potential due to a point charge to determine the potential at different distances:V = k * q /…
Correct answer: 5/3V- A. spherical distribution of charge
- B. line distribution of charge
- C. surface distribution of charge
- D. point charge
Explanation: Coulomb's law describes the electrostatic force between two point charges.
Correct answer: point charge- A. 1.6 x 10^-19 C
- B. 3.2 x 10^-19 C
- C. -3.2 x 10^-19C
- D. neutral
Explanation: The charge of one electron is 1.6×10^−19 C. When two electrons are removed, the net charge on the conductor is 2×(1.6×10^−19)=3.2×10^−19…
Correct answer: -3.2 x 10^-19C- A. 16 N
- B. 1 N
- C. 64 N
- D. 32 N
Explanation: According to Coulomb's law( F = k * (|q₁| * |q₂|) / d²), the force between two charges is inversely proportional to the square of the…
Correct answer: 16 N168. Two lines of force
- A. Intersect in non-uniform field
- B. Intersect in a uniform field
- C. Intersect at a far distance from the charge
- D. Never intersect
Explanation: According to the principles of electric field lines, electric field lines never intersect each other.
Correct answer: Never intersect169. Capacitance with air is 10 F. If a dielectric of εr =100 is inserted, then the new capacitance is
- A. 1000 F
- B. 1000 nF
- C. 10 nF
- D. 100 F
Explanation: The new capacitance with the dielectric inserted is given by C′=εr ×C. Here, εr =100 and C=10 F.
Correct answer: 1000 F- A. near positive charge
- B. near negative charge
- C. between two equal and oppositely charged plates
- D. between two equal and oppositely charged infinite plates
Explanation: Uniform electric fields are typically created between two parallel plates with equal and opposite charges.
Correct answer: between two equal and oppositely charged plates- A. zero
- B. 2σ/εο
- C. σ/2εo
- D. σ/4εο
Explanation: When one of the oppositely charged plates is removed, the electric field between them no longer exists.
Correct answer: σ/2εo- A. Independent of r and d
- B. Proportional to r² + d²
- C. Proportional to r²
- D. Inversely proportional to (r + d)²
Explanation: The correct option is:(d) Inversely proportional to (r + d)²Here's why each option is correct or incorrect:(a) Independent of r and d…
Correct answer: Inversely proportional to (r + d)²173. If the electric intensity E is along the X-axis, then the equipotential surfaces are parallel to
- A. XOY plane
- B. XOZ plane
- C. YOZ plane
- D. None of these
Explanation: Equipotential surfaces are surfaces where the electric potential is constant.
Correct answer: YOZ plane- A. 8 J
- B. 16 J
- C. 4 x10^-3 J
- D. 2 x10^-3 J
Explanation: By using the formula U= ½ CV2Where C= 1 micro farad and V= 4000VU= ½ x (1 x 10-6) x (4000)2= 8
Correct answer: 8 J- A. √2 C
- B. 2 C
- C. c/√2
- D. C/2
Explanation: The capacitance of a parallel plate capacitor with a dielectric material between the plates is given by the formula:C= k. ε0.
Correct answer: C/2- A. C
- B. C/2
- C. 0
- D. 2C
Explanation: When a metal plate of thickness half the separation between the capacitor plates is inserted between the plates, the new capacitance can…
Correct answer: 2C- A. Weber meter 2 (Wb m^2)
- B. Weber (Wb)
- C. Weber /meter (Wb/m)
- D. Weber / meter4 (Wb/m^4)
Explanation: Therefore, the Weber (Wb) is the standalone SI unit for measuring magnetic flux
Correct answer: Weber (Wb)- A. 0.1v
- B. 8v
- C. 2v
- D. 0.5v
Explanation: We can solve this problem using the formula for potential difference:Potential difference (V) = Work done (W) / Charge (Q)Given…
Correct answer: 0.1v- A. 3.9
- B. 4
- C. 4.2
- D. 6
Explanation: We can find the number of excess electrons on the oil drop using the following steps:Define the charge of an electron:The charge of a…
Correct answer: 4- A. q=Q/4
- B. q=Q/2
- C. q=Q
- D. none
Explanation: The force of repulsion between two charges depends on the product of their charges and the square of the distance between them, as…
Correct answer: q=Q/2