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 17 of 42
- A. 1.6 x 10^-27 C
- B. Zero
- C. 1.6 x 10^-31 C
- D. 9.11 x 10^-19 C
- E. 9.6 x 10^-15 C
Explanation: Neutrons are electrically neutral, meaning they have no charge. This is because they have an equal number of protons and electrons, which…
Correct answer: Zero- A. 0.5 C
- B. 4 C
- C. 0.25 C
- D. 2 C
Explanation: The capacitance is inversely proportional to distance between the plates. Halving the distance would double the capacitance giving us 2C.
Correct answer: 2 C- A. Decrease the capacitance three times
- B. Decrease the capacitance nine times
- C. Increase the capacitance three times
- D. Increase the capacitance six times
Explanation: Capacitance of a parallel plate capacitor is given by the formula C = ε₀(A/d), where C is the capacitance, ε₀ is the permittivity of free…
Correct answer: Increase the capacitance three times- A. Voltage
- B. Current
- C. Energy
- D. Power
Explanation: Some of the common units for Energy are: Joules (J), Electron Volt (eV) which is equivalent to 1.60x10-19J, kilowatt-hour (kWh) which is…
Correct answer: Energy- A. q1 + q2
- B. q1 - q2
- C. q1/q2
- D. q1 x q2
Explanation: Coulomb's Law states that the electrical force between two charged objects is directly proportional to the product of the quantity of…
Correct answer: q1 x q2- A. d
- B. d2
- C. 1/d
- D. 1/d2
Explanation: Force between two charges q1 and q2 separated by a distance r is proportional to q1 x q2 / r2
Correct answer: 1/d2- A. parabolic
- B. circular
- C. parallel to v
- D. parallel to E
Explanation: In an electric field charged particles move in a parabola - the shape a projectile follows.
Correct answer: parabolic- A. X, Y and Z
- B. X only
- C. X and Z only
- D. Y only
Explanation: The field is formed between the 2 charges which is from +ve charge to the -ve charge so there's no way any electric field will be on X or…
Correct answer: Y only- A. Sharp graphics
- B. Dry writing
- C. Wet writing
- D. Wet graphics
Explanation: Charles Carlson lived in that time and saw a need for a quick and easy way to make copies.
Correct answer: Dry writing- A. Selenium is a good conductor
- B. Selenium is a good insulator
- C. Selenium is an insulator in the dark and becomes conductor when exposed to light
- D. Selenium is an conductor in the dark and becomes insulator when exposed to light
Explanation: As selenium(Se) element number is 34 having 2 ½ spins are vacant. So, it mostly acts as photocells which take the energy from the sun as…
Correct answer: Selenium is an insulator in the dark and becomes conductor when exposed to light- A. E = mg / q
- B. E = mg / qv
- C. E = mg / qvB
- D. E = q / mg
Explanation: Electric force (F) = electric field (E) x charge (q) whereas weight = mass x gravitational field So E = mg / q
Correct answer: E = mg / q- A. F=Kq1q2/r2
- B. F=2Kq1q2/r3
- C. F=Kq1/r
- D. F=Kq1/q2
Explanation: Coulomb's law states that electric force is directly proportional to the product of two point charges and inversely proportional to the…
Correct answer: F=Kq1q2/r2- A. at A only
- B. at B only
- C. at C only
- D. at A, B and C
Explanation: Point C has no charge thus the electric field can be zero. (Note that when the charge is positive, the electric field is away from the…
Correct answer: at C only- A. X, Y and Z
- B. X only
- C. X and Z only
- D. Y only
Explanation: In the given configuration of charges X, Y, and Z, the net electric field directed to the left can be determined by considering the…
Correct answer: Y only- A. E=F/q
- B. E=F2/q
- C. E=F/3q
- D. None of them
Explanation: Electric field intensity is the strength of an electric field at a specific point, measured by the force exerted on a unit positive charge…
Correct answer: E=F/q- A. Always horizontal
- B. Always vertical
- C. Radially towards the charge
- D. Radially away from the charge
Explanation: Because positive charges repel each other, the electric field around an isolated positive charge is oriented 'radially outward'.
Correct answer: Radially away from the charge- A. Electrostatic
- B. Magnetic
- C. Both A and B
- D. None of these
Explanation: 'Electrostatic induction', also known as "electrostatic influence" or simply "influence", is a redistribution of electric charge in an…
Correct answer: Electrostatic- A. 9 x 10^7
- B. 6 x 10^7
- C. 10 x 10^9
- D. 9 x 10^9
Explanation: The Coulomb constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in…
Correct answer: 9 x 10^9- 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- A. Electric potential energy
- B. Electric field strength
- C. Electric potential
- D. Electric field
Explanation: The strength of an electric field E at any point may be defined as the electric, or Coulomb, force F exerted per unit positive electric…
Correct answer: Electric field strength