Electrostatics – Objective Questions
Electric Charges & Fields | JEE Main + Advanced
Section A: Single Correct Answer
-
Two point charges +q and −q are placed at a distance d apart.
The electric field at the midpoint is:
- A. Zero
- B. q / (4πε₀ d²)
- C. 2q / (4πε₀ d²)
- D. Infinite
-
The SI unit of electric flux is:
- A. N/C
- B. N·m²/C
- C. V/m
- D. C/m²
-
Electric field inside a charged conducting spherical shell is:
- A. Maximum
- B. Minimum
- C. Zero
- D. Depends on radius
-
Which law is useful only for highly symmetric charge distributions?
- A. Coulomb’s law
- B. Gauss’s law
- C. Ohm’s law
- D. Faraday’s law
Section B: Multiple Correct Answers
-
Which of the following are true about electric flux?
- A. It is a scalar quantity
- B. Depends on enclosed charge
- C. Depends on surface shape
- D. Independent of external charges
-
For a conductor in electrostatic equilibrium:
- A. Electric field inside is zero
- B. Charge resides on surface
- C. Potential is constant
- D. Electric field is maximum inside
Section C: Assertion–Reason
Assertion (A): Electric field inside a conductor is zero.
Reason (R): Charges redistribute themselves to cancel internal field.
- A. Both A and R true, R explains A
- B. Both true, R does not explain A
- C. A true, R false
- D. A false, R true
Section D: Integer Type
-
Electric flux through a closed surface enclosing charge 5 μC is
(ε₀ = 8.85 × 10⁻¹² C²/N·m²)
Answer: Φ = Q/ε₀ = 5 × 10⁻⁶ / 8.85 × 10⁻¹² ≈ 5.65 × 10⁵ N·m²/C -
Number of field lines emerging from a +2 μC charge if 1 μC corresponds to 100 lines?
Answer: 200
Section E: JEE Advanced Conceptual Traps
- Flux can be zero even if electric field is not zero
- Electric field can be zero but potential non-zero
- Gauss law is always true, not always useful
- External charges never affect net flux
✅ Electrostatics Objective Set – Completed
Next Options:
• Electrostatics – Advanced Numerical Problems
• Electrostatic Potential – Objective Questions
• Mixed Electrostatics JEE Advanced Test
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