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 33 of 42
- A. Depends on the maximum surface area of the capacitor plates
- B. Depends on the maximum resistance offered by the circuit
- C. Depends on the maximum electric field the dielectric can withstand
- D. Depends on the maximum current passing through the capacitor
Explanation: The maximum energy that can be stored in a capacitor depends on the maximum electric field that the dielectric material can withstand…
Correct answer: Depends on the maximum electric field the dielectric can withstand- A. 200C
- B. 100C
- C. 300C
- D. 400C
Explanation: The correct answer is 300C. To calculate the total charge stored in the system, we first determine the total capacitance of the circuit.
Correct answer: 300C- A. F/2
- B. 4F
- C. 2F
- D. F/4
Explanation: According to Coulomb's Law, the electrostatic force (F) between two point charges is inversely proportional to the square of the distance…
Correct answer: F/4- A. F
- B. F/2
- C. F/4
- D. F/8
Explanation: When the two identical metal balls are connected by a conducting wire, charge redistribution occurs.
Correct answer: F/8- A. Increases
- B. Remains the same
- C. Decreases
- D. May increase or decrease depending on the magnitude of the charge
Explanation: The correct answer is Option A: Increases. When a positive charge is moved against the direction of an electric field, work is done on the…
Correct answer: Increases- A. Neutrons
- B. X-rays
- C. Y-rays (Gamma rays)
- D. None
Explanation: An electric field exerts force on charged particles, causing them to move.
Correct answer: None- A. NC-1
- B. NV-1
- C. Vm-1
- D. None of these
Explanation: The correct answer is Option B: NV-1. Electric intensity, also known as electric field strength, is measured in units of Newtons per…
Correct answer: NV-1- A. 4.5 x 10^6 N/C
- B. 3.5 x 10^5 N/C
- C. 3.5× 10₀ N/C
- D. 4.5 x 10^5 N/C
Explanation: E = F/q Where F is the force and q is the chargeSo,E = kq2/qr2 Where K is the value of 1/(4πεo)E = kq/r2E = (9x109 x 2x10-5) / (0.2)2E =…
Correct answer: 4.5 x 10^6 N/C- A. EA<ES
- B. EA=EB
- C. EA>ES
- D. None of these
Explanation: Field will be stronger where field lines are closer to each other i.e. EA>ES .
Correct answer: EA>ES- A. 3 x 10^2 V m-1
- B. 3 x 10^4 V m-1
- C. 3Vm-1
- D. 3 x 10^-4 V m-1
Explanation: The electric field E between two plates is calculated using the formula E = V/d, where V is the potential difference and d is the distance…
Correct answer: 3 x 10^4 V m-1- A. Always straight
- B. Sometimes curved
- C. Always curved
- D. None of the above
Explanation: The explanation is given below: Electric field lines (or lines of force) are not always straight; they can be curved.
Correct answer: Always curved- A. σ /2ϵ0
- B. σ
- C. σ /ϵ0
- D. Zero
Explanation: According to Gauss's Law, for two infinite parallel plates with uniform charge densities +σ and -σ, the electric field between them is…
Correct answer: σ /ϵ0- A. Electric intensity due to different charge configurations
- B. Electric intensity due to positive charge only
- C. Electric intensity due to negative charge only
- D. None of these
Explanation: Gauss's law relates the electric flux through a closed surface to the charge enclosed by that surface.
Correct answer: Electric intensity due to different charge configurations- A. 1.6
- B. 8
- C. 5
- D. 40
Explanation: The dielectric constant (K) of a material inserted between the plates of a capacitor is defined as the ratio of the original potential…
Correct answer: 8- A. The same charge on each
- B. The same energy
- C. The same potential
- D. The same field on their surface
Explanation: When two conductive spheres are connected by a thin wire, they reach an equilibrium state where their electric potentials are equal.
Correct answer: The same potential- A. 9V
- B. 8 x 10^4 V
- C. 9 x 10^5V
- D. 80 V
Explanation: We know that the elementary charge, e, is approximately 1.6 × 10-19 C. Therefore, the charge of the nucleus, Q, can be calculated as…
Correct answer: 8 x 10^4 V- A. 1000 V
- B. 10 V
- C. 100 V
- D. 0 V
Explanation: When a dielectric material with a dielectric constant K is introduced into a capacitor, the capacitance C increases by a factor of K.
Correct answer: 10 V- A. Inversely proportional to the square of the distance
- B. Inversely proportional to the distance
- C. Directly proportional to the square of the distance
- D. Directly proportional to the distance
Explanation: The electric potential V at a point due to a point charge Q is given by the formula V = kQ/r, where k is a constant (Coulomb's constant)…
Correct answer: Inversely proportional to the distance- A. VA=VB
- B. VA>VB
- C. VA<VB
- D. Depends upon the material of the sphere
Explanation: For spheres with the same charge, the electric potential V at the surface is given by V = kq/r, where Q is the charge, R is the radius…
Correct answer: VA>VB660. Two charge +q and -q are situated at a certain distance. At the point exactly midway between them
- A. Electric field and potential both are zero
- B. Electric field is not zero but potential is not zero
- C. Electric field is zero but potential is not zero
- D. Electric field is not zero but potential is zero
Explanation: At the midpoint between two equal and opposite charges, the electric potential is zero because potential is a scalar quantity and the…
Correct answer: Electric field is not zero but potential is zero