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 23 of 42
- A. The particle moves along the electric line of force passing through it.
- B. The particle moves opposite to the electric line of force passing through it.
- C. The direction of acceleration of the particle is tangential to the electric line of force at every instant.
- D. The direction of acceleration of the particle is normal to the electric line of force at every instant.
Explanation: A negatively charged particle experiences a force opposite to the direction of the electric field (or electric lines of force).Since it…
Correct answer: The particle moves opposite to the electric line of force passing through it.- A. Negative
- B. Positive
- C. May be positive or negative
- D. Cannot be determined
Explanation: According to Coulomb's law When the charges have opposite signs, the force is attractive (negative F), while if both charges have the same…
Correct answer: Positive- A. 8 × 10−11C
- B. 2 × 10−12C
- C. 3 × 10−11C
- D. 6 × 10−10C
Explanation: The electric field (E) due to a point charge (q) at a distance (r) is given by the formula E = k * |q| / r2, where k is the electrostatic…
Correct answer: 8 × 10−11C- A. All charged particles experience the same force
- B. All charged particles move with the same velocity
- C. All electric field lines are directed towards positive charges
- D. All electric field lines are parallel
Explanation: In case of the uniform electric field, the two electric field lines are1. straight2. parallel3.
Correct answer: All electric field lines are parallel- A. 6.25 x 10^21
- B. 1.6 x 10^19
- C. 6.25 x 10^18
- D. 9.1 x 10^31
Explanation: 6.25×1018 are the number of electrons in one coulomb of charge.
Correct answer: 6.25 x 10^18- A. V(t) = V0e-t/RC
- B. V(t) = V0(1 - e-t/RC)
- C. V(t) = V0et/RC
- D. V(t) = V0t/RC
Explanation: Option A is the correct option since Voe-t/RC gives the correct instantaneous voltage.
Correct answer: V(t) = V0e-t/RC- A. A:+4 x 10^3 ε0
- B. B:-4 x 10^3 ε0
- C. C:0 ε0
- D. D:+8 x 10^3 ε0
Explanation: Flux2-flux1= q/epsilon notQ= (4×103 - 8×103) epsilon
Correct answer: B:-4 x 10^3 ε0- A. 3 ∶ 1
- B. 1 ∶ 1
- C. 11 ∶ 8
- D. 3 ∶ 8
Explanation: Electrostatic force is a mutual force that will not act on a single charge.
Correct answer: 1 ∶ 1- A. CV
- B. ½ nCV2
- C. CV2
- D. CV2/2n
Explanation: The energy of a capacitor is calculated using the formula = ½ C V2 multiplied by n i.e number of capacitors
Correct answer: ½ nCV2- A. It collapse
- B. Its radius increases
- C. Its radius decreases
- D. None of the above
Explanation: When some charge is placed on a soap bubble then the radius of the bubble will increase.
Correct answer: Its radius increases- A. 4.9 x 10^3 N C-1
- B. 4.9 x 10^6 N C-1
- C. 4.9 x 10^5 N C-1
- D. 4.9 x 10^9 NC-1
Explanation: The electric force is equal to the weight.Electric force = Weight Eq = mgElectric field strength E = mg / q {mass should be in kg.)E =…
Correct answer: 4.9 x 10^3 N C-1- A. 120 x 10^6 C, -420 x 10^6 C
- B. 320 x 10^-6 C, 420 x 10^-6 C
- C. 420 x 10^-6 C, 320 x 10^-6 C
- D. 720 x 10^-6 C, 720 x 10^-6 C
- E. 620 x 10^-6 C, 420 x 10^-6 C
Explanation: Charge remains same in series and charges of both capacitors are only same in Option D and so it is the right answer.You can even…
Correct answer: 720 x 10^-6 C, 720 x 10^-6 C- A. A resultant force and a couple
- B. Only force
- C. Only couple
- D. Any of the above
Explanation: An electric dipole always experiences a torque when placed in either uniform or non-uniform electric field.
Correct answer: A resultant force and a couple- A. 2000 V/m
- B. 1000 V/m
- C. 500 V/m
- D. 300 V/m
Explanation: We know formulaE=V/dWhere V is V1-V2V1 is 20VV2 is -20Vd is 2cm , 0.02 in mSoE = 20-(-20) / 0.02m= 20+20 /0.02= 40 / 0.02= 2000 V/m
Correct answer: 2000 V/m- A. 288 C, 288 C
- B. 4770 C, 4770 C
- C. 5810 C, 6610 C
- D. 7170 C, 8140 C
Explanation: In series, charge remains same. This cancels option C and D.To calculate Total capacitance:1/C = 1/12 + 1/24 C=8FC=Q/V8 x 36= 288COption A…
Correct answer: 288 C, 288 C- A. Gravitational energy
- B. Kinetic energy
- C. Electric intensity
- D. Magnetic induction
Explanation: In capacitors, energy is stored in the form of electric potential energy or electric intensity while in an inductor it is stored in the…
Correct answer: Electric intensity- A. Absolute electric potential
- B. Change in K.E
- C. Change in potential energy
- D. Electric intensity
Explanation: Absolute electric potential is the amount of potential energy needed to move a unit positive charge from infinity to a specific point…
Correct answer: Absolute electric potential- A. An electric field
- B. A gravitational field
- C. Thermal field
- D. Closed field
Explanation: The space surrounding a charged object is affected by the presence of the charge; an electric field is established in that space.
Correct answer: An electric field- A. Electric Force
- B. Electric Flux
- C. Electric Potential
- D. Electric Intensity
Explanation: The force per unit charge is known as:E=F/q. This formula is for electric field intensity.
Correct answer: Electric Intensity- A. Electric box
- B. Capacitor
- C. Inductor
- D. Transistor
Explanation: It is the function of capacitors to store charge.
Correct answer: Capacitor