NEET Physics: Electrostatic Potential and Capacitance — MCQ Test 25

Q6. Two charges \( 8 \, \mu\text{C} \) and \( -4 \, \mu\text{C} \) are at \( (-6, 0, 0) \) and \( (6, 0, 0) \, \text{cm} \) in an external field \( E = 10^5/r^2 \, \text{N/C} \). What is the total potential energy? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

Q7. A \( 2 \, \mu\text{F} \) capacitor charged to \( 400 \, \text{V} \) is connected to an uncharged \( 6 \, \mu\text{F} \) capacitor. What is the energy lost?

Q8. A charge of \( 7 \, \mu\text{C} \) is moved from infinity to a point where the potential is \( 100 \, \text{V} \). What is the work done?

Q9. Two charges \( 16 \, \mu\text{C} \) and \( -4 \, \mu\text{C} \) are at \( (4, 0, 0) \) and \( (-4, 0, 0) \, \text{cm} \). What is the potential at midpoint? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

Q10. An electric dipole with moment \( p = 8 \times 10^{-9} \, \text{C m} \) lies along the y-axis. What is the potential at \( (0, -4, 0) \, \text{m} \)? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

NEET Physics — Electrostatic Potential and Capacitance

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Two charges \( 32 \, \mu\text{C} \) and \( -16 \, \mu\text{C} \) are placed 32 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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10
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Key concepts covered in this specific test include Potential, Varepsilon, Electric, Strength, Parallel, and Capacitor.

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 \( 32 \, \mu\text{C} \) and \( -16 \, \mu\text{C} \) are placed 32 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. -14 J
  • B. -15 J
  • C. -14.4 J
  • D. -16 J

Q2. Why does the energy density in an electric field depend on the square of the field strength?

  • A. Due to the field's linear variation
  • B. Due to the permittivity's dependence on \( E \)
  • C. Due to the quadratic nature of energy storage
  • D. Due to the inverse square law of fields

Q3. A point charge \( Q = 5 \times 10^{-9} \, \text{C} \) is placed at the origin. What is the potential at a point 10 m away from the charge? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

  • A. 4.5 V
  • B. 5 V
  • C. 6 V
  • D. 7 V

Q4. A parallel plate capacitor with \( C = 90 \, \text{pF} \) in air has a dielectric (\( K = 9 \)) inserted fully between plates. What is the new capacitance?

  • A. 800 pF
  • B. 810 pF
  • C. 820 pF
  • D. 900 pF

Q5. Why does the electric field near the edge of a charged conducting plate differ from the field at the center of the plate?

  • A. Charge density is uniform across the plate
  • B. The field lines are denser at the center
  • C. The plate's thickness varies at the edges
  • D. Field lines fringe outward at the edges

+ 5 more questions in the actual test

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