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 16 of 42
- A. 9 uF
- B. 2 uF
- C. 10 uF
- D. 90 uF
- E. 5 uF
Explanation: 1/C1 + 1/C2 = 1/C⅓ + ⅙ = 1/C2 + 1 /6 = 1/C3/6 = 1/C½ =1 /CC = 2 uF
Correct answer: 2 uF- A. Decreasing velocity and decreasing acceleration
- B. Decreasing velocity and increasing acceleration
- C. Decreasing velocity and constant acceleration
- D. Increasing velocity and decreasing acceleration
- E. Increasing velocity and increasing acceleration
Explanation: In this scenario, the small sphere (+q) is initially at rest near a larger fixed sphere (+Q).
Correct answer: Increasing velocity and decreasing acceleration- A. 1.0 m2
- B. 3.0 m2
- C. 5.5 m2
- D. 7.5 m2
Explanation: To find the area of each plate, we use the formula for the capacitance of a parallel plate capacitor: C = ε0 * (A/d), where C is the…
Correct answer: 1.0 m2- A. 2880 x 10^-6 C , 2880 x 10^-6
- B. 4770 x 10^-6 C, 4770 x 10^-6
- C. 5810 x 10^-6 , 6610 x 10^-6
- D. 7170 x 10^-6 , 8140 x 10^-6
- E. 9090 x 10^-6 , 8880 x 10^-6
Explanation: Charge throughout the circuit is the same so either the answer is A or B, as only these options have the same charge…
Correct answer: 2880 x 10^-6 C , 2880 x 10^-6- A. 2 V
- B. 1 V
- C. 0.5 V
- D. 3 V
Explanation: Electric potential is given by V= kQ/rAs V is inversely proportional to r so increasing the R by a factor of 2 (1m to 2m), the electric…
Correct answer: 0.5 V- A. Increase
- B. Increase exponentially
- C. Decrease
- D. Remain same
Explanation: The strength of the electric field is reduced due to the presence of dielectric.
Correct answer: Decrease- A. Gravitational
- B. Electrical potential
- C. Magnetic field
- D. Potential
Explanation: Energy is stored in a form of electrostatic field between plates of capacitor.
Correct answer: Electrical potential- A. Time
- B. Charge
- C. Distance
- D. Capacitor
Explanation: The formula for charging and discharging capacitor is RC=TR: resistance C: capacitanceT: time for charging/ discharging
Correct answer: Time- A. Gauss's Law
- B. Ohm's Law
- C. Faraday's Law
- D. Newton's Law
- E. Coulomb's Law
Explanation: The statement given is a direct description of Coulomb's Law. This law quantitatively defines the electrostatic force between two point…
Correct answer: Coulomb's Law- A. Electric intensity
- B. Electric flux
- C. Electric current
- D. Electric potential
- E. Dielectric constant
Explanation: The correct answer is Electric current. Electric current is the rate at which electric charge flows past a point or through a region.
Correct answer: Electric current- A. 9.6 x 10^-19 J
- B. 12.1 x 10^-19 J
- C. 14.5 x 10^-19 J
- D. 16.7 x 10^-19 J
- E. 18.5 x 10^-19 J
Explanation: To find the energy acquired by the particle, use the formula: Energy = qV, where q is the charge and V is the potential difference.
Correct answer: 9.6 x 10^-19 J- A. Coulomb surface
- B. Gaussian surface
- C. Ohm surface
- D. Faraday surface
Explanation: Gauss's law states that the total electric flux through a closed surface, also known as a Gaussian surface, is equal to the total charge…
Correct answer: Gaussian surface- A. 98 volts ... 32 volts
- B. 120 volts ... 60 volts
- C. 68 volts ... 96 volts
- D. 30 volts ... 65 volts
- E. 25 volts ... 25 volts
Explanation: Since the voltage is INVERSELY proportional to the capacitance, according to the formula: Q=CV, the voltage division is also in the same…
Correct answer: 120 volts ... 60 volts- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Explanation: As the electric field moves away from positive charges and towards negative charges, the direction of the electric field should be towards…
Correct answer: Option A- A. Added to double
- B. Reduced to half
- C. Remains same (no effect)
- D. Cancel each other effect
Explanation: Electric potential is a scalar quantity. At the midpoint of two positively charged point charges, the electric potentials of both charges…
Correct answer: Added to double- A. 2U
- B. 3U
- C. U/2
- D. 4U
Explanation: The energy stored in a capacitor (U) is given by the formula:U = (1/2) * C * V^2where C is the capacitance of the capacitor and V is the…
Correct answer: 4U- A. Doubled
- B. Half
- C. 4-times
- D. 1/4th
Explanation: The size of the force varies inversely as the square of the distance between the two charges.
Correct answer: 1/4th- A. 1.67 x 10^-11 C/kg
- B. 1.76 x 10^11 C/kg
- C. 16.7 x 10^11 C/kg
- D. 1.76 x 10^-11 C/kg
Explanation: The specific charge is being asked here. The formula for that is:Q/m {where Q is the charge of the electron and m is the mass.}Substitute…
Correct answer: 1.76 x 10^11 C/kg- A. 3 m
- B. 5 m
- C. 4 m
- D. 2 m
Explanation: We have to search for the null point where the resultant field is zero.
Correct answer: 2 m- A. 120 x 10^-6 C, 420 x 10^-6 C
- B. 320 x 10^-6 C, 420 x 10^-6 C
- C. 420 x 10^-6 C, 320 x 10^-6 C
- D. 72 x 10^-5 C, 72 x 10^-5 C
- E. 820 x 10^-6 C, 420 x 10^-6 C
Explanation: The formula for calculating the charge on a capacitor is:Charge = Capacitance * VoltageIn this case, the voltage across both capacitors is…
Correct answer: 72 x 10^-5 C, 72 x 10^-5 C