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 40 of 42
- A. E=O
- B. E < mg / q
- C. E=mg / q
- D. E > mg / q
Explanation: If particle moves with constant velocity, by Newton's laws, net force (ΣF) is zero.
Correct answer: E=mg / q- A. 100 J
- B. 50 J
- C. 150 J
- D. 200 J
Explanation: The work done on a charge in an electric field can be calculated using the formula:Work = Charge × Electric Field × DistanceIn this case…
Correct answer: 100 J783. The electric potential difference between two points A and B in an electric field can be defined as:
- A. Work done in carrying a unit positive charge from infinity to B while keeping the charge in equilibrium.
- B. Work done in carrying a unit positive charge from A to infinity while keeping the charge in equilibrium.
- C. Work done in carrying a unit positive charge from A to B while keeping the charge in equilibrium.
- D. Work done in carrying a unit positive charge from A to B
Explanation: Option C is correct since it is the exact definition of potential difference between two points.
Correct answer: Work done in carrying a unit positive charge from A to B while keeping the charge in equilibrium.- A. Volts
- B. Coulomb
- C. Meter
- D. newton's
Explanation: Option A is correct since the correct unit of potential difference in volts.
Correct answer: Volts785. Resistance in RC circuit of time constant 2 seconds is 1000 Ohms. What is value Of C in the circuit?
- A. 2 u farad.
- B. 20 u farad
- C. 200 u farad
- D. 2000 u farad
Explanation: An RC time constant is given by,t=R×C.Given that,t=2 secondR= 1000 Ohms then,2=1000 x CC = 2/1000C= 0.002C = 2 x 10-3 FC = 2 x 10-3 /…
Correct answer: 2000 u farad- A. Double
- B. Half
- C. Four-times
- D. Eight-times
Explanation: The capacitance of a parallel plate capacitor is given by C = A/D Where ε is the permittivity of the dielectric, A is the area of the…
Correct answer: Double- A. 1 x 10^-9 C
- B. 1 x 10^9 C
- C. 2 x 10^-9C
- D. 4 x 10^-9 C
Explanation: From coulomb's law we knowF=Kq1q2/r²Rearranging the equation, we get:q2=Fxr²/Kxq1 =2x9/9x10⁹x1 =2x10-⁹C Ans
Correct answer: 2 x 10^-9C- A. Perpendicular to the direction of field
- B. Opposite to the direction of force
- C. At a certain angle
- D. Along the direction of force
Explanation: Electric intensity, also known as electric field intensity, is the force experienced by a unit positive charge placed at a point in an…
Correct answer: Along the direction of force- A. 1440i+1080jV/m
- B. 1240i+1280jN/C
- C. 1440i+1080jN/C
- D. 1240i+1080jN/C
Explanation: The formula for the electric field strength is E=(K x Charge, Q)/distance2.
Correct answer: 1440i+1080jN/C- A. An electric field.
- B. A magnetic field.
- C. Both magnetic and electric fields.
- D. Neither magnetic nor electric fields.
Explanation: An electric charge produces an electric field around it, and when the electric charge is in motion it causes a change in position of the…
Correct answer: Both magnetic and electric fields.- A. Controls the number of waves
- B. Controls the brightness of the spot formed
- C. Accelerates electrons
- D. Has positive potential with respect to the cathode
Explanation: The correct answer is B: The grid in a cathode ray oscilloscope controls the brightness of the spot formed on the screen.
Correct answer: Controls the brightness of the spot formed792. The magnitude of an electric field between two separated plates can be calculated by the relation:
- A. ΔV = Ed
- B. ΔV = E/d
- C. ΔV = E/qo
- D. E = d/ΔV
Explanation: The correct answer is Option A: ΔV = Ed. This formula is used to calculate the magnitude of the electric field (E) between two parallel…
Correct answer: ΔV = Ed- A. NmC-1
- B. Nm-2C-2
- C. Nm2C-1
- D. Nm2C-2
Explanation: Electric flux is defined as the product of the electric field and the area through which the field lines pass.
Correct answer: Nm2C-1- A. Capacitance
- B. Potential difference between two points
- C. Intensity of electric field
- D. Resistance between two points
Explanation: Explanation:The workdone in moving a unit positive charge from one point to another against the electric field is equal to the potential…
Correct answer: Potential difference between two points- A. 9.6 x 10^-19 J
- B. 9.1 x 10^-19 J
- C. 1.6 x 10^-19 J
- D. 6.0 x 10^-19 J
Explanation: Explanation: Charge = q = 2e Potential difference = V = 3V Energy = E = ?As we know that, E = qV = (2e)(3V) = 6eV E = 6 (1.6 × 10-19) E =…
Correct answer: 9.6 x 10^-19 J- A. 1.6 x 10^-19 J
- B. 125 J
- C. 125 x 10^-19 J
- D. 125 x 1.6 x 10^-19 J
Explanation: Electric Potential Energy = Electric Potential x ChargeCharge = 5 x 1.6 x 10-19 CElectric Potential Energy = 25V x (5 x 1.6 x 10-19) CThis…
Correct answer: 125 x 1.6 x 10^-19 J797. Which one of the following must be decreased in order to increase the capacitance of a capacitor?
- A. The area of the plates
- B. The distance between the plates
- C. The number of the plates
- D. The dielectric constant
Explanation: The formula for capacitance is C = εo εr A/d. Decreasing the distance between the plates would increase the capacitance since C is…
Correct answer: The distance between the plates- A. 6 volt
- B. 1 volt
- C. 3 volt
- D. 2 volt
Explanation: When capacitors are connected in series, the total capacitance (C_total) is given by the reciprocal of the sum of the reciprocals of the…
Correct answer: 6 volt- A. Relative permittivity
- B. Permittivity
- C. Permeability
- D. Electric polarization
Explanation: The ratio of the capacitance of the capacitor with a dielectric to the capacitance of the same capacitor with free space is given by the…
Correct answer: Relative permittivity- A. 1/2 CV2
- B. 1/2 QV
- C. 1/2 m v2
- D. Both A and B
Explanation: The correct answer is Option D: Both A and B. The energy stored in a charged capacitor can be represented by the formulas E = 1/2 CV² or E…
Correct answer: Both A and B