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 24 of 42
461. The change in potential energy per unit charge between two points in an electric field is called:
- A. Potential difference
- B. Absolute potential
- C. Electric Intensity
- D. Permitivity
Explanation: The difference in electric potential energy of a unit charge between two points within the electric field is called the electric potential…
Correct answer: Potential difference- A. Surface area of the sphere
- B. Radius of the sphere
- C. Charge at the centre of the sphere
- D. Nature of charge
Explanation: According to Guass' Law flux through a surface is proportional to the charge enclosed at its center.
Correct answer: Charge at the centre of the sphere- A. 90°
- B. 60°
- C. 30°
- D. 0o
Explanation: The electric flux through the surface is minimum when the angle between E and A is 90° and is maximum when the angle is 0∘.
Correct answer: 90°- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: In a capacitive circuit, the defining characteristic is that the current leads the voltage by 90 degrees.
Correct answer: Option A- A. Decreasing velocity and increasing acceleration
- B. Decreasing velocity and constant acceleration
- C. Increasing velocity and decreasing acceleration
- D. Increasing velocity and increasing acceleration
Explanation: When the smaller charge is placed, it undergoes repulsion as 'like' charges repel. Since it was at zero velocity, the velocity increases.
Correct answer: Increasing velocity and decreasing acceleration- A. Series
- B. Parallel
- C. Both of them
- D. None of them
Explanation: Correct option is A.For capacitors in series, the total capacitance can be found by adding the reciprocals of the individual capacitances…
Correct answer: Series- A. 9 µF
- B. 2 µF
- C. 10 µF
- D. 90 µF
- E. 5 µF
Explanation: 1/C1 + 1/C2 = 1/C⅓ + ⅙ = 1/C2 + 1 /6 = 1/C3/6 = 1/C½ =1 /CC = 2 µF
Correct answer: 2 µF- A. kg m s-3 A-1
- B. kg s-2A-3
- C. kg2 s-3A-2
- D. m s-1 A-3
Explanation: Force-mass x acceleration-kg x ms-2.Q=current(1) x time(t)=IT=A.sE=F/Q-kg ms-2/As .E=kgms-3A-1As it is a numerical, it can have only one…
Correct answer: kg m s-3 A-1- A. 9.8 x 10^7
- B. 9.8 x 10^5
- C. 9.8 x 10^3
- D. 9.8 x 10^1
Explanation: To make the coin float, the upward electric force must equal the downward gravitational force.
Correct answer: 9.8 x 10^7- A. q2
- B. Only the positive charges
- C. Zero
- D. +q1 and -q1
Explanation: The charge q2 is outside the Gaussian surface.External charges do not contribute to net flux through the closed surface.They may produce a…
Correct answer: Zero- A. Mass of each body remains unchanged
- B. Mass of each body changes marginally
- C. Mass of each body changes slightly and hence the total mass
- D. Mass of each body changes slightly but the total mass remains the same
Explanation: When two bodies are charged by rubbing, electrons are transferred from one body to the other.
Correct answer: Mass of each body changes slightly but the total mass remains the same- A. The forces acting on them will be equal
- B. Their accelerations may be equal
- C. Magnitude of acceleration may be equal
- D. Magnitude of acceleration will be different
Explanation: In a uniform electric field, the neutron experiences no force because it is uncharged.
Correct answer: Magnitude of acceleration will be different- A. V/3r
- B. V/4r
- C. V/6r
- D. V/2r
Explanation: For a hollow charged metal sphere, the electric field intensity outside the sphere is determined by the potential difference V and the…
Correct answer: V/6r- A. Potential gradient
- B. Amount of the charge
- C. Potential difference
- D. Surface charge density
Explanation: The change in electric potential with respect to distance is ΔV/Δr which represent s potential gradient. Hence, option A is correct.
Correct answer: Potential gradient- A. 1 keV
- B. 1 MeV
- C. 1 GeV
- D. 1 eV
Explanation: The amount of energy required in moving an electron of charge by application of 1V potential difference equals to 1 eV.
Correct answer: 1 eV- A. Ohm's law
- B. Lenz's law
- C. Coulomb's law
- D. Ampere's law
Explanation: Coulomb's law represents the relation between amount of charges and force between them. STB Pg-40 Hence, option C is correct.
Correct answer: Coulomb's law- A. Size of the charge
- B. Effective area for electrostatic force
- C. Path followed by the charge
- D. Speed of the charge
Explanation: The electric field lines represent the area around charge where the electrostatics force of charge can be experienced by other charges.
Correct answer: Effective area for electrostatic force478. 1 N/C equals to:
- A. 1 V/m
- B. 1 J/C
- C. 1 C/m2
- D. sec-1
Explanation: V/m = J/C/m = N × m/ m× C = N/C. Hence, Option A is correct.
Correct answer: 1 V/m- A. Independent of charge
- B. Independent of medium
- C. Independent of shape of surface in which charge is enclosed
- D. Independent position of charge in shape
Explanation: Electric flux is given as; Φ =Q/ε0So, electric flux depends upon medium and charged enclosed.
Correct answer: Independent of shape of surface in which charge is enclosed- A. 8 x 10^-4 C, 8 x 10^-4 C
- B. 8μC, 8μC
- C. 8 x 10^4C, 16 x 10^4C
- D. 800C, 800C
Explanation: As C1= 6µF C2 = 12µF V = 200V Ceq = 6(12)/18 = 4µF Q = CV = 4 ×10^-6 × 200 = 8 × 10^-4C In series, charge remains same, so same charge…
Correct answer: 8 x 10^-4 C, 8 x 10^-4 C