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Electrostatics & Capacitors
JEE Physics • 10 questions • Free on ExamBattle
Practice Questions
Q1
Two point charges +4 μC and −4 μC are placed 0.2 m apart. The force between them is (k = 9×10⁹ N·m²/C²):
- A. 0.36 N
- B. 3.6 N
- C. 36 N
- D. 0.036 N
Q2
The electric field at a point 0.3 m from a point charge of 5 μC in vacuum is:
- A. 5×10⁵ N/C
- B. 5×10³ N/C
- C. 5×10⁶ N/C
- D. 5×10⁴ N/C
Q3
Three capacitors of 2 μF, 3 μF, and 6 μF are connected in series. The equivalent capacitance is:
- A. 11 μF
- B. 1 μF
- C. 2 μF
- D. 3 μF
Q4
A capacitor of 4 μF is charged to 100 V. The energy stored is:
- A. 0.01 J
- B. 0.02 J
- C. 0.04 J
- D. 0.4 J
Q5
When a dielectric slab of relative permittivity 4 is inserted in an isolated capacitor, the capacitance:
- A. Decreases by a factor of 4
- B. Increases by a factor of 4
- C. Remains unchanged
- D. Increases by a factor of 2
Q6
According to Gauss's law, the electric flux through a closed surface enclosing a charge of 8.85 μC is (ε₀ = 8.85×10⁻¹² C²/N·m²):
- A. 10⁶ N·m²/C
- B. 10³ N·m²/C
- C. 10⁹ N·m²/C
- D. 10⁴ N·m²/C
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