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 35 of 42
- A. 6
- B. 5
- C. 4
- D. 3
Explanation: The capacitance of a parallel plate capacitor is given by the formula C = ε₀ * (A/d), where ε₀ is the permittivity of free space, A is the…
Correct answer: 6- A. Only a magnetic field
- B. Only an electric field
- C. Neither electric field nor magnetic field
- D. Both electric and magnetic field
Explanation: An electric charge at rest produces an electric field around it, which can exert forces on other charges within the field.
Correct answer: Only an electric field- A. 9 x 10^9 N
- B. 9.2 x 10^4 N
- C. 9 x 10^8 N
- D. 9 x 10^10 N
Explanation: Option A is correct as:Felect = k • Q1 • Q2 / d2Felect = (9.0 x 109 N•m2/C2) • (1.00 C) • (1.00 C) / (1.00 m)2Felect = 9.0 x 109 N
Correct answer: 9 x 10^9 N- A. 5µ F capacitor
- B. 6µ F capacitor
- C. 7µ F capacitor
- D. Same potential difference across all
Explanation: Option A is correct as: Q=CV Q/C=V Capacitance is inversely proportional to Voltage So 5µ F capacitor will have maximum potential…
Correct answer: 5µ F capacitor- A. Remain the same
- B. Increase
- C. Decrease
- D. Become zero
Explanation: When a test charge is moved from a lower potential point to a higher potential point, work is done against the electric field.
Correct answer: Increase- A. Remains the same
- B. Initially maximum then decreases to zero
- C. Becomes zero then increases to maximum
- D. Remains zero
Explanation: When an uncharged capacitor is connected in series with a resistor and a battery, and the switch is closed, the circuit allows maximum…
Correct answer: Initially maximum then decreases to zero- A. 2.44N
- B. 0.144N
- C. 1.89N
- D. 3.144N
Explanation: Let the two charges be Q1 & Q2 and according to coulomb's force, F=kq1q2where, ATQ, F=9N R=d⇒9=KQ1 Q2 /d2 9d2=KQ1 Q2 ⟶(1)Now, in 2nd case…
Correct answer: 0.144N- A. 10V
- B. Same as at point 5cm away from the surface
- C. 0V
- D. Same as at point 25cm away from the surface
Explanation: The correct answer is 10V. For a hollow metal sphere, the electric field inside the sphere is zero, leading to a constant potential…
Correct answer: 10V- A. A
- B. B
- C. C
- D. D
Explanation: The correct representation of electric field lines for a negative point charge is diagram B, where the lines are directed inwards towards…
Correct answer: B690. If the distance between the plates of parallel plates condenser is increased, its potential will:
- A. Remain the same
- B. Increase
- C. Decrease
- D. Decrease exponentially
Explanation: When the distance between the plates of a parallel plate capacitor is increased, the capacitance (C) decreases, given a constant charge…
Correct answer: Increase- A. 0 Joules
- B. E*q
- C. -E*q
- D. q*V
Explanation: The correct answer is Option A: 0 Joules. In electrostatics, the electric field is conservative, meaning that the work done in moving a…
Correct answer: 0 Joules- A. Capacitance
- B. Seperation of plates
- C. Energy stored
- D. Electric intensity
Explanation: Option C is correct as Area under graph = Area under triangle = 0.5 x base X height Area under graph = 0.5 Q X V =Energy stored between…
Correct answer: Energy stored- A. Is least along the path AB
- B. Is zero along all the paths AB, AC, AD and AE
- C. Is least along AE
- D. Is least along the path AD
Explanation: Option B is correct as the charge is placed at point O and the dotted lines represent equipotential surface and work done in carrying a…
Correct answer: Is zero along all the paths AB, AC, AD and AE- A. Along a line of force, if it has some initial velocity in the direction of an acute angle with the line of force
- B. Always along a line of force
- C. Along a line of force, if its initial velocity is zero
- D. None of these
Explanation: Option B is correct as the charge will always move along lines of force regardless of its initial velocity
Correct answer: Always along a line of force- A. 20 N/C
- B. 500N/C
- C. 5 N/C
- D. 250 N/C
Explanation: Electric Field (E)=Potential Difference (V)/Distance between the Plates (d) Given: Potential Difference (V) = 10 volts Distance between…
Correct answer: 500N/C- A. It would decrease by a factor of 4
- B. It would decrease by a factor of 2
- C. It would remain unchanged
- D. It would increase by a factor of 2
Explanation: The electrostatic force between two charged particles is determined by Coulomb's law:F = k * q1 * q2 / r2where F is the electrostatic…
Correct answer: It would remain unchanged697. In bringing an electron towards the second electron the electrostatics potential of the system:
- A. Increase
- B. Remain the same
- C. Decrease
- D. Become zero
Explanation: When two electrons are brought closer together, the electrostatic potential energy of the system increases due to the repulsive forces…
Correct answer: Increase- A. The electric field is zero, but the potential is non-zero.
- B. The electric field is non-zero, but the potential is zero.
- C. Both the electric field and potential are zero.
- D. Both the electric field and potential are non-zero.
Explanation: In an equilateral triangle with charges 2q, -q, and -q at the vertices, the potential at the center is calculated by summing the…
Correct answer: The electric field is non-zero, but the potential is zero.- A. 14.4 x 10^4 volt
- B. 7.2 x 10^8 volt
- C. 7.2 x 10^14 volt
- D. 14.4 x 10^8 volt
Explanation: Option C is correct Number of protons in tin nucleus = 50 Total charge = 50 X 1.66X10-19 Potential at that point = k x (net charge ) /…
Correct answer: 7.2 x 10^14 volt- A. Electric field is zero but electric potential is non-zero
- B. Electric field is non-zero but electric potential is zero
- C. Both electric field and electric potential are zero
- D. Neither electric field nor electric potential is zero
Explanation: The point of intersection of the diagonals of the square is equidistant from all the charges at the corners.
Correct answer: Electric field is non-zero but electric potential is zero