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 30 of 42
- A. Electrical intensity
- B. Electric flux
- C. Magnetic intensity
- D. Magnetic flux
Explanation: The electric field at any point is negative of the potential gradient; as we proceed from the positive charge and toward the negative one…
Correct answer: Electrical intensity- A. All three capacitors in series
- B. Two capacitors are in series, one in parallel
- C. Two capacitors are in parallel, one in series
- D. All three capacitors in parallel
Explanation: C1 and C2 are in series Capacitance (C12) of C1 and C2 will be, C12 = 1/C1 + 1/C2 C12 = 1/2 + 1/2 C12 = 1C C3 is parallel to C1 and C2 So…
Correct answer: Two capacitors are in series, one in parallel- A. 3q
- B. 2q
- C. 4q
- D. 5q
Explanation: Option A is correct as to balance out the force on q on either side Q must be equal to "3q".
Correct answer: 3q- A. A plane infinite sheet of charge
- B. A point charge
- C. Electric dipole
- D. Line charge of infinite length
Explanation: Option A is correct since there is no relation of the electric field of an infinite plane sheet of charge with distance according to the…
Correct answer: A plane infinite sheet of charge- A. All three capacitors in series
- B. Two capacitors are in series, one in parallel
- C. Two capacitors are in parallel, one in series
- D. All three capacitors in parallel
Explanation: When these three capacitors are connected in series, then the resultant is 1 microcoulomb.
Correct answer: All three capacitors in series- A. All three capacitors in series
- B. Two capacitors are in series, one in parallel
- C. Two capacitors are in parallel, one in series
- D. All three capacitors in parallel
Explanation: For capacitors in parallel, the total capacitance is calculated through;Ct = C1 + C2 + C3Ct = 6μCThis gives the highest net capacitance…
Correct answer: All three capacitors in parallel587. Aluminum is _.
- A. An excellent conductor
- B. A semiconductor
- C. An insulator
- D. A photoconductor
Explanation: Option A is correct because aluminum is metal and has free electrons. As metals are conductors so aluminum is a metal and thus an…
Correct answer: An excellent conductor- A. It moves in the direction of the electric field
- B. It accelerates in the direction of the electric field
- C. It moves in the direction opposite to the electric field
- D. It accelerates in the direction opposite to the electric field
Explanation: An electron is held within an electric field, when the electron is released it accelerates in the direction opposite to the magnetic field.
Correct answer: It accelerates in the direction opposite to the electric field- A. ½ εrεo E
- B. ½ εrεo E2
- C. εrεo E
- D. εrεo E2
Explanation: Energy density is generally given as ½ εo E2. However, if the medium is different from free space, the permittivity of free space εo will…
Correct answer: ½ εrεo E2- A. Capacitance remains same
- B. Capacitance becomes double
- C. Capacitance becomes four times
- D. Capacitance reduces to half
Explanation: The capacitance of a capacitor is given by the formula:C = εA/dWhere,C is the capacitance ε is the permittivity of the medium between the…
Correct answer: Capacitance becomes four times- A. A
- B. B
- C. C
- D. D
Explanation: Option A is the correct option since Voe-t/RC gives the correct instantaneous voltage.
Correct answer: A- A. A
- B. B
- C. C
- D. D
Explanation: flux2-flux1= q/epsilon notQ= (4×103 - 8×103) epsilon
Correct answer: B- A. Decreases
- B. Increases
- C. Remains constant
- D. Becomes zero
Explanation: The dielectric placed between the plates of the capacitor reduces the electric field strength between the plates of the capacitor, this…
Correct answer: Increases- A. Gravitational Potential
- B. Chemical Potential
- C. Electric Intensity
- D. Magnetic Induction
Explanation: A capacitor stores energy in form of electrostatic field (or electricfield intensity) between the plates of the capacitor.
Correct answer: Electric Intensity- A. A
- B. B
- C. C
- D. D
Explanation: In capacitive circuit, current leads voltage by 90-degrees. Hence option A is correct.
Correct answer: A- 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. Gauss's Law
- B. Ohm's law
- C. Faraday's law
- D. Newton's Law
- E. Coulomb's Law
Explanation: The above statement is the definition of Coulomb's Law which states that the electrostatic force(F) between two point charges is directly…
Correct answer: Coulomb's Law- A. All three capacitors are in series
- B. Two capacitors are in series, one in parallel
- C. Two capacitors are in parallel, one in series
- D. All three capacitors are in parallel
Explanation: When capacitors are connected in parallel, the equivalent capacitance is the sum of the individual capacitances.
Correct answer: All three capacitors are in parallel- A. Magnetic
- B. Electric
- C. Static
- D. All of these options are correct
Explanation: This option D suggests that all of the mentioned fields (magnetic, electric, and static) can be developed when a charge experiences a…
Correct answer: All of these options are correct- A. 18 x 10^4 volt
- B. 1.8 x 10^6 volt
- C. 1.8 x 10^9 volt
- D. 1.8 x 10^4 volt
Explanation: V=KQ/r where K= coulomb's constantV=(9*109)*(2*10-6)/1 = 18000 volts = 1.8*104
Correct answer: 1.8 x 10^4 volt