NEET Physics: Electrostatic Potential and Capacitance — MCQ Test 11

Q6. A \( 7 \, \mu\text{F} \) capacitor is charged to \( 400 \, \text{V} \). What is the energy stored in it?

Q7. Two capacitors of \( 20 \, \text{pF} \) and \( 30 \, \text{pF} \) are connected in series. What is the equivalent capacitance?

Q8. In a system where a charged conductor is placed inside a larger uncharged hollow conductor, why does the inner conductor induce charges on both the inner and outer surfaces of the outer conductor?

Q9. Why does the capacitance of a parallel plate capacitor increase when the plates are moved closer while maintaining the same dielectric?

Q10. A dipole \( p = 3 \times 10^{-9} \, \text{C m} \) is rotated from \( \theta = 0^\circ \) to \( 180^\circ \) in a field \( E = 4 \times 10^5 \, \text{N/C} \). What is the work done?

NEET PhysicsElectrostatic Potential and Capacitance

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Two charges \( 15 \, \mu\text{C} \) and \( -5 \, \mu\text{C} \) are placed 12 cm apart. What is the potential energy of the system? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

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About this NEET MCQ Test

This page provides a free online MCQ test for NEET Physics preparation, focusing specifically on the chapter Electrostatic Potential and Capacitance. It contains 10 carefully selected multiple-choice questions (MCQs) designed to test your conceptual understanding and exam readiness.

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Key concepts covered in this specific test include Potential, Varepsilon, Parallel, Capacitor, Dielectric, and Inserted.

Taking these timed MCQ tests helps you simulate the real NEET exam environment. Detailed step-by-step explanations are provided for every question to help you learn from your mistakes and strengthen your fundamentals.

Preview of Questions in this Test

Q1. Two charges \( 15 \, \mu\text{C} \) and \( -5 \, \mu\text{C} \) are placed 12 cm apart. What is the potential energy of the system? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

  • A. -5 J
  • B. -6 J
  • C. -5.625 J
  • D. -5.5 J

Q2. A parallel plate capacitor with \( C = 50 \, \text{pF} \) in air has a dielectric (\( K = 4 \)) inserted fully between plates. What is the new capacitance?

  • A. 180 pF
  • B. 200 pF
  • C. 220 pF
  • D. 240 pF

Q3. Why does the electric field inside the dielectric of a parallel plate capacitor decrease when the dielectric is inserted while keeping the plates disconnected?

  • A. Due to increased capacitance
  • B. Due to decreased potential difference
  • C. Due to increased charge on the plates
  • D. Due to polarization opposing the applied field

Q4. A spherical conductor of radius 10 cm has a charge of \( 2 \times 10^{-7} \, \text{C} \). What is the electric field at a point 15 cm from its center? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

  • A. 6 × 10⁴ N/C
  • B. 7 × 10⁴ N/C
  • C. 8 × 10⁴ N/C
  • D. 9 × 10⁴ N/C

Q5. Four capacitors of \( 25 \, \mu\text{F} \) each are in series. What is the equivalent capacitance?

  • A. 6 µF
  • B. 6.5 µF
  • C. 7 µF
  • D. 6.25 µF

+ 5 more questions in the actual test

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