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 6 of 42
- A. work
- B. work done per unit charge
- C. electric field per unit charge
- D. electric force per unit charge
Explanation: The dimension of electric potential is represented as M1L2T-3I-1 which indicates that it has the same dimensions as that of work done per…
Correct answer: work done per unit charge- A. 0.32 μJ
- B. 0.32 nJ
- C. 0.32 pJ
- D. 0.32 fJ
Explanation: Change in Kinetic energy is equivalent to work done.We know that W = VqWhere W is the work done, V is the potential difference through…
Correct answer: 0.32 pJ- A. Electric flux
- B. Electric field
- C. Electric potential
- D. Electric intensity
Explanation: OPTION A: Electric flux is defined as: The number of lines of force that pass through the area placed in the electric field.OPTION B: An…
Correct answer: Electric potential- A. Infinity
- B. Zero
- C. Negative
- D. Positive
Explanation: Option B is correct since the electric potential at infinite distance is zero.Electric potential is the amount of electric potential…
Correct answer: Zero- A. 12.0 J.
- B. 16.5 J.
- C. 19.5 J.
- D. 27.0 J.
Explanation: The correct answer is option A: 12.0 J. The total energy dissipated in the circuit can be calculated using the formula: energy = charge x…
Correct answer: 12.0 J.- A. Increases.
- B. Decreases.
- C. Becomes zero.
- D. Remains the same.
Explanation: Electric potential energy is the energy a charge has due to its position in an electric field.
Correct answer: Increases.- A. double
- B. half
- C. remains the same
- D. becomes 4 times
Explanation: Electric force is given by F=Kq1q2/r2. Here q1 and q2 are the magnitudes of the point charges and r is the distance between them.
Correct answer: becomes 4 times- A. 3.2x I 0-19C
- B. 9.1×10⁹C
- C. No definite value exists
- D. 1.6 x 10^-19C
Explanation: This the charge on an electron or a proton. As a charged body must have at a electron or proton.
Correct answer: 1.6 x 10^-19C- A. 2E
- B. 3E
- C. 4E
- D. E
Explanation: Electric field a point 2m from the is E=Kq/(2)2 and Electric field a point 1m from the is E'=Kq/(1)2.
Correct answer: 4E- A. the charge of an electron
- B. the mass of an electron
- C. the ratio of charge to mass for an electron
- D. the sign of a charge on electron
Explanation: The purpose of Millikan's oil drop experiment was to determine the charge of the electron by suspending the oil drop, charged with a…
Correct answer: the charge of an electron- A. 1/4th of its original value
- B. 1/8th of its original value
- C. 4 times of original value
- D. 8 times of original value
Explanation: Electric force is given by F=Kq1q2/r2. Here q1 and q2 are the magnitudes of the point charges and r is the distance between them.
Correct answer: 4 times of original value- A. Electric flux
- B. Electric field intensity
- C. electric potential
- D. all of the above
Explanation: The force per unit charge is known as electric field or electric intensity.Electric Intensity(E)= Force(F)/charge (Q
Correct answer: Electric field intensity- A. neutrons
- B. gamma rays
- C. X rays
- D. None
Explanation: Electric field can only exert a force of charged particles. None of the given option are charged particles.
Correct answer: None- A. only magnetic field
- B. both magnetic and electric field
- C. neither electric nor magnetic field
- D. only electric field
Explanation: An electric charge at rest only produces an electric field.
Correct answer: only electric field- A. 4 π ε⁰
- B. εo
- C. 4 π/ ε0
- D. εo-1
Explanation: We let a Gaussian surface around the unit positive.According to gausses law Electric flux= Charge enclosed/ εo .
Correct answer: εo-1- A. 60⁰
- B. 90⁰
- C. 30⁰
- D. 0⁰
Explanation: Electric flux is the dot product of the Electric field and the area vector of the surface.Electric flux(ɸ) = EA cosϴThe area vector of a…
Correct answer: 90⁰117. The unit of εr
- A. Nm-1 A-1
- B. N-1m1C²
- C. Nm²C²
- D. no unit
Explanation: εr is the relative permittivity. It is the ratio is permittivity of the substance and the permittivity of free space.εr= ε / εoHence, it…
Correct answer: no unit- A. imaginary
- B. physicallu existing everywhere
- C. physically existing near the charges
- D. depends on case
Explanation: They are imaginary lines used to represent an electric field.
Correct answer: imaginary- A. 2µF
- B. 1/2µF
- C. 4µF
- D. 1/4µF
Explanation: The formula for equivalent capacitance is Ceq= C1 + C2So, the equivalent capacitance in this case is Ceq=2+2= 4 µF
Correct answer: 4µF- A. W/4
- B. W/2
- C. 4W
- D. 2W
Explanation: Energy stored in a capacitor is given as W=1/2QV. The new charge is Q'=2Q.The new energy is W'=1/2 Q'V=1/2(2Q)V = QV = 2W.
Correct answer: 2W