NEET Physics: Electrostatic Potential and Capacitance — MCQ Test 9

Q6. A capacitor of \( 5 \, \mu\text{F} \) is charged to \( 100 \, \text{V} \). What is the energy stored in it?

Q7. A point charge \( Q = 24 \times 10^{-9} \, \text{C} \) is placed at the origin. Calculate the potential at a point 8 m away from the charge. (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

Q8. A spherical conductor of radius 25 cm has a charge of \( 10 \times 10^{-8} \, \text{C} \). What is the electric field at 60 cm from the center? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

Q9. An electric dipole with moment \( p = 6 \times 10^{-10} \, \text{C m} \) lies along the x-axis. What is the potential at \( (5, 0, 0) \, \text{m} \)? (Take \( \frac{1}{4 \pi \varepsilon_0} = 9 \times 10^9 \, \text{Nm}^2 \text{C}^{-2} \)).

Q10. A dipole with \( p = 3 \times 10^{-10} \, \text{C m} \) makes an angle of \( 90^\circ \) with a uniform field \( E = 2 \times 10^5 \, \text{N/C} \). What is its potential energy?

NEET Physics — Electrostatic Potential and Capacitance

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A parallel plate capacitor with capacitance \( 60 \, \text{pF} \) has a dielectric (\( K = 4 \), thickness \( d/4 \)) inserted. What is the new capacitance? (Original separation \( d \)).

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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 Parallel, Capacitor, Capacitance, Dielectric, Thickness, 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. A parallel plate capacitor with capacitance \( 60 \, \text{pF} \) has a dielectric (\( K = 4 \), thickness \( d/4 \)) inserted. What is the new capacitance? (Original separation \( d \)).

  • A. 70 pF
  • B. 72 pF
  • C. 75 pF
  • D. 73.85 pF

Q2. Two capacitors of \( 60 \, \text{pF} \) and \( 120 \, \text{pF} \) are connected in series. What is the equivalent capacitance?

  • A. 35 pF
  • B. 40 pF
  • C. 45 pF
  • D. 50 pF

Q3. A dipole with \( p = 6 \times 10^{-9} \, \text{C m} \) makes an angle of \( 45^\circ \) with a uniform field \( E = 5 \times 10^4 \, \text{N/C} \). What is its potential energy?

  • A. -2.5 × 10⁻⁴ J
  • B. -2.121 × 10⁻⁴ J
  • C. -2 × 10⁻⁴ J
  • D. -1.5 × 10⁻⁴ J

Q4. A parallel plate capacitor with capacitance \( 120 \, \text{pF} \) has a dielectric (\( K = 4 \), thickness \( d/4 \)) inserted. What is the new capacitance? (Original separation \( d \)).

  • A. 140 pF
  • B. 145 pF
  • C. 150 pF
  • D. 147.69 pF

Q5. Why does the potential energy of an electric dipole in a uniform electric field become minimum when the dipole aligns with the field?

  • A. The field exerts maximum torque
  • B. The dipole moment cancels the field
  • C. The field becomes non-uniform
  • D. The torque is zero at alignment

+ 5 more questions in the actual test

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