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 28 of 42
- A. Retentivity
- B. Potential difference
- C. Intensity
- D. Permittivity
- E. Permeability
Explanation: Potential difference, also known as voltage, is the difference in electric potential energy between two points in an electric field.
Correct answer: Potential difference- A. 9 x 10^4 C/kg
- B. 1.76 x 10° C/kg
- C. 1.76 x 10^11 C/kg
- D. 1.602 x 10 C/kg
- E. 1.602 x 10^11 C/kg
Explanation: The charge to mass ratio (e/m) of an electron is:1.76 x 10^11 C/kg.
Correct answer: 1.76 x 10^11 C/kg- A. Ampere
- B. Coulomb
- C. Volt
- D. Watt
- E. Ohm
Explanation: The volt measures electric potential difference or voltage.
Correct answer: Volt- A. Coulomb
- B. Constant of proportionality
- C. Relative permittivity of the medium
- D. Permittivity of the space
- E. Permittivity of the medium
Explanation: In Coulombs' law "k" is the constant of proportionality.
Correct answer: Constant of proportionality- A. They act on charges
- B. They act on masses
- C. They can be attractive.
- D. They can be repulsive
Explanation: Option B is Incorrect because electric forces act on charge, not mass (gravitational forces act on mass).
Correct answer: They act on masses- A. Force between two point charges is inversely proportional to the product of the charges and directly proportional to the square of the distance between them.
- B. Force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
- C. Force between two point charges is directly proportional to the sum of the charges and inversely proportional to the square of the distance between them.
- D. Force between two point charges is directly proportional to the product of the charges and to the square of the distance between them.
Explanation: Coulomb's law describes the electrostatic interaction between charged particles.
Correct answer: Force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.- A. Electric intensity
- B. Electric power
- C. Electric potential
- D. Electric field gradient
Explanation: V=W/q is the formula of electric potential.
Correct answer: Electric potential- A. A: Coulomb
- B. B: Volt
- C. C: Farad
- D. D: Ampere
Explanation: The S.I unit of capacitance is the Farad (F). This unit quantifies how much electric charge a capacitor can store per volt applied across…
Correct answer: C: Farad- A. Non-uniform
- B. Uniform
- C. Cannot be predicted
- D. Variable
Explanation: The electric intensity (or electric field strength) between two oppositely charged plates, such as in a parallel plate capacitor, is…
Correct answer: Uniform- A. 1200V
- B. 300V
- C. 150V
- D. 2400V
Explanation: The potential difference V can be found using the formula = W/q=600/2=300 V
Correct answer: 300V- A. C^2/Nm^2
- B. C^-1/Nm^-2
- C. C^2/Nm
- D. no Unit
Explanation: Relative permittivity is a ratio so it has no units.
Correct answer: no Unit552. The electrostatic force between two point-charges is independent of one of the following quantities.
- A. Distance between charges
- B. Magnitude of charges
- C. Medium between charges
- D. Temperature of charges
Explanation: According to coulomb's law F=kq1q2/r2 where k=1/4 πϵo the electrostatic forces are independent of temperature.
Correct answer: Temperature of charges- A. Newton per Ampere
- B. Newton per volt
- C. Volt per Coulomb
- D. Volt per metre
Explanation: Volt per meter (V/m) is a derived unit that represents electric field strength.
Correct answer: Volt per metre- A. 6.25 x 10^15
- B. 6.25 x 10^16
- C. 6.25 x 10^17
- D. 6.25 x 10^18
Explanation: According to the formula n=Q/e (where n is number of electrons, Q is 1 C and e is the charge of one electron) =1C/1.602×10 −19 = 6.242 x…
Correct answer: 6.25 x 10^18- A. 250 J
- B. 310 J
- C. 500 J
- D. 650 J
Explanation: from the formula E= 1/2CV2 =1/2 x 20 x 52 =10 x 25 =250 J
Correct answer: 250 J- A. Becomes four times
- B. Doubles
- C. Increases by half
- D. Triples
Explanation: When the separation between the two charges is decreased by 50%, the force between them increases to four times its original value
Correct answer: Becomes four times- A. 2kQ/d
- B. kQ/d
- C. -kQ/d
- D. zero
Explanation: The electric potential between the midpoint of two opposite charges with equal magnitudes is always zero.
Correct answer: zero- A. Increases four times
- B. Increases six times
- C. Is doubled
- D. Remains the same
Explanation: When the distance between the plates is reduced to half and the area of the plates is doubled, the capacitance increases to four times its…
Correct answer: Increases four times- A. The electric field becomes zero
- B. The electric field decreases
- C. The electric field increases
- D. The electric field remains the same
Explanation: When the dielectric material between the plates of a capacitor is removed, the electric field (E) between the plates generally increases.
Correct answer: The electric field increases- A. Dielectric constant
- B. Plate area
- C. Permittivity
- D. Plate separation
Explanation: Increasing the plate separation (d) decreases the capacitance, as the capacitance is inversely proportional to the distance between the…
Correct answer: Plate separation