Free Electrostatics MCQs with Answers

• A. Charge enclosed
• B. Radius of sphere
• C. Surface area
• D. Both surface area and charge enclosed

Explanation: According to Gauss's law, the electric flux through any closed surface is proportional to the total electric charge enclosed within that…

• A. V/C
• B. N/C
• C. N/V
• D. Nm

Explanation: Since the electric field is defined as a force per charge, its units would be force units divided by charge units.

• 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: b) Two capacitors are in series, one in parallel: Let's say C_a and C_b are the two capacitors in series, and C_c is the capacitor in…

• A. Newton/volt
• B. Coulomb / volt
• C. Coulomb/joule
• D. Coulomb/newton

Explanation: A farad (F) is the standard unit of capacitance (C) in the International System of Units (SI).

• A. A/d
• B. Aεo/d
• C. Aεo/2d
• D. Aεo/d2

Explanation: C=ε0A/dWhen the plates are separated by air or free space. ε0 is called the permittivity of free space.

• A. It remains the same
• B. It reverses direction
• C. It changes in a way that cannot be determined
• D. 3.1 x 10^5 N/C

Explanation: The presence of the test charge at point P does not affect the external electric field because it is much smaller than the source charges…

• A. Half
• B. Double
• C. One fourth
• D. Four times

Explanation: The force between two point charges is given by Coulomb's law:F = (kq1q2)/r2where F is the force, q1 and q2 are the charges, r is the…

• A. 9 x 10^9 Nm2
• B. 9 x 10^9 Nm2 / C2
• C. 9 x 10^-9 Nm2 / C2
• D. 9 x 10^-9 Nm2

Explanation: The value of the Coulomb constant, also known as the electric constant is approximately 9 x 109 Nm2/C2.

• A. In the direction opposite to electric field.
• B. In the direction of electric field.
• C. In the direction perpendicular to electric field.
• D. In the direction perpendicular to the velocity of charge.

Explanation: Option A: This option is incorrect. A positive charge will experience a force in the same direction as the electric field, not opposite to…

• A. Parallel
• B. Series
• C. Both of them
• D. None of them

Explanation: Option A: The combination C = C + C + C + ... + C represents the combination of multiple capacitors connected in parallel.Therefore, the…

• A. Magnetic field
• B. Parallel plate
• C. Electric field
• D. Coil

Explanation: Option A: A capacitor does not store energy in its magnetic field. Capacitors are primarily designed to store and release electrical…

• A. Greater than unity
• B. Less than unity
• C. Equal to unity
• D. Zero

Explanation: The value of permittivity of a material is inversely proportional to its tendency to allow coulombic interactions.

• A. It increases
• B. It decreases
• C. It remains same
• D. It changes in a way you cannot determine because of the complex circuit

Explanation: When the key is pressed, the plate separation is decreased, and the capacitance increases.

• A. Objects A and C possess charges of the same sign
• B. Objects A and C possess charges of opposite sign
• C. All three objects possess charges of the same sign
• D. Additional experiments must be performed to determine information about the charges on the objects

Explanation: The key to solving this problem lies in understanding the fundamental electrostatic principle that like charges repel and opposite charges…

• A. Store charge
• B. Store electric field
• C. Gain potential difference
• D. Store magnetic field

Explanation: The capacitance of a capacitor is a measure of its ability to store charge.

• A. Directly proportional
• B. Inversely proportional
• C. Equal
• D. None of these options are correct

Explanation: OPTION A: This statement is incorrect. The electrostatic force is not directly proportional to the square of the radius.OPTION B…

• A. Objects A and C possess charges of the same sign, but not B.
• B. Objects A and C possess charges of the opposite sign.
• C. All three objects possess charges of the same sign.
• D. One object is neutral.

Explanation: Like charges repel each other by nature and unlike charges attract each other by nature.

• A. Electrons
• B. Protons
• C. Holes
• D. All of these options are correct

Explanation: An uncharged conductor is electrically neutral, meaning it has an equal number of protons and electrons.

• A. Work done in bringing a unit positive charge from infinity to that point
• B. Work done in bringing a unit positive charge from infinity to that point while keeping the charge in equilibrium
• C. Work done in bringing a unit negative charge from infinity to that point while keeping the charge in equilibrium
• D. Work done in bringing a unit negative charge from infinity to that point

Explanation: Electric potential at a point is defined as the amount of work done in moving a unit positive charge from infinity to that point.

• A. 12 V
• B. 43.2 V
• C. 1.2 x 10^11 V
• D. 432 V

Explanation: Q= 7.2x105CC=6x10-6FAs, Q= CVV= Q/CV= 7.2x105C / 6x10-6FV=1.2x1011V