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 34 of 42
- A. Q, -Q
- B. Q/2, -Q/2
- C. Q, Q
- D. Q, 0
Explanation: A capacitor is a device that stores electrical energy in an electric field, created by two conductive plates separated by an insulator.
Correct answer: Q, -Q- A. 1/2 CV2
- B. Less than 1/2 CV2
- C. More than 1/2 CV2
- D. Zero
Explanation: When a capacitor is charged through a resistor, the battery provides energy not only to store charge in the capacitor but also to overcome…
Correct answer: More than 1/2 CV2- A. 2.5 x 10^-5 C
- B. 2.4 x 10^-6 C
- C. 2.4 x 10^-5 C
- D. 2.5 x 10^5 C
Explanation: To find the charge stored in a capacitor, use the formula Q = CV, where Q is the charge, C is the capacitance, and V is the voltage.
Correct answer: 2.4 x 10^-5 C- A. 10V
- B. 20V
- C. 40V
- D. 50V
Explanation: Explanation is given below:V=Q/C= 20 x 10 -6/ 2 x 10-6= 10 V
Correct answer: 10V- A. 800µC
- B. 1200µC
- C. 900µC
- D. 1600µC
Explanation: Explanation is given below:Q=CV=(200 uC)(6 V)= 1200 uC
Correct answer: 1200µC- A. 1.694 x 10^9 m2
- B. 9.281 x 10^9 m2
- C. 4.529 x 10^9 m2
- D. 12.981 x 10^9 m2
Explanation: To find the area of the plates of a parallel plate capacitor, use the formula for capacitance: C = ε₀(A/d), where C is the capacitance, ε₀…
Correct answer: 1.694 x 10^9 m2- A. C/4
- B. C/2
- C. 4C
- D. 2C
Explanation: The capacitance of a capacitor is given by the formula C = ε₀ε_rA/d, where ε₀ is the permittivity of free space, ε_r is the relative…
Correct answer: 4C- A. Increases by a factor of K
- B. Decreases by a factor of K
- C. Increases by a factor of K2
- D. Decreases by a factor of K2
Explanation: The capacitance of a capacitor is given by the formula C = ε₀KA/d, where ε₀ is the permittivity of free space, K is the dielectric…
Correct answer: Increases by a factor of K- A. The capacitance decreases
- B. The capacitance increases
- C. The capacitance remains the same
- D. The capacitance becomes zero
Explanation: Introducing a dielectric between the plates of a capacitor increases the capacitance.
Correct answer: The capacitance increases- A. Decrease
- B. Remains unchanged
- C. Increase
- D. Become Zero
Explanation: The capacitance of a capacitor is determined by the formula C = εA/d, where ε is the permittivity of the dielectric material, A is the…
Correct answer: Increase- A. Resistor
- B. Good conductor
- C. Insulator
- D. Semiconductor
Explanation: The correct answer is that an electric material must be a good conductor.
Correct answer: Good conductor- A. Distance between plates
- B. Thickness of plates
- C. Area of plates
- D. All of the above
Explanation: The capacitance of a capacitor is determined by the formula C = ε(A/d), where ε is the permittivity of the dielectric material, A is the…
Correct answer: Thickness of plates- A. Energy per farad
- B. Energy per coulomb
- C. Energy per volume
- D. Energy
Explanation: The expression 1/2 εoE2 represents the energy density in an electric field, which is the energy stored per unit volume.
Correct answer: Energy per volume- A. U=CV2/2
- B. U=q2/2C
- C. U=2qV
- D. U=qV/2
Explanation: Um= 1/2 CV2=1/2 (Q/V)(V2)=1/2 QV.hence,the energy stored is not represented by this formula.
Correct answer: U=2qV- A. 2 times
- B. 4 times
- C. 10 times
- D. Remains same
Explanation: The energy stored in a capacitor is given by the formula U = 1/2 C V², where U is the energy, C is the capacitance, and V is the potential…
Correct answer: 4 times- A. 4 volts
- B. 2 volts
- C. 9 volts
- D. 1 volt
Explanation: The energy stored in a capacitor is given by the formula E = 0.5 * C * V^2 where E is the energy in joules, C is the capacitance in…
Correct answer: 2 volts- A. 0.5 CV2
- B. CV2
- C. 0.5C2V
- D. 0.5CV
Explanation: The correct answer is Option A: 0.5 CV2. The energy stored in a capacitor when it is charged is given by the formula E = 0.5CV2.
Correct answer: 0.5 CV2- A. 2 joules
- B. 6 joules
- C. 4 joules
- D. 8 joules
Explanation: The energy stored in a capacitor is given by the formula E = 0.5 * C * V^2, where E is the energy in joules, C is the capacitance in…
Correct answer: 8 joules- A. Rapidly
- B. Exponentially
- C. Linearly
- D. Logarithmically
Explanation: Capacitors charge and discharge in an exponential manner due to the relationship between current, voltage, and resistance in the circuit.
Correct answer: Exponentially- A. Slowly
- B. Quickly
- C. With medium speed
- D. Both 'A' and 'C'
Explanation: The RC time constant (τ = RC) determines how quickly a capacitor charges or discharges in a circuit.
Correct answer: Quickly