NEET Physics: Electric Charges and Fields — MCQ Test 3

Q6. A conducting sphere of radius 16 cm has an electric field of \( 5 \times 10^3 \, \text{N/C} \) at 40 cm from its center. What is the charge?

Q7. A conducting sphere of radius 23 cm has a surface charge density of \( 35 \, \mu\text{C/m}^2 \). What is the total charge?

Q8. Two charges \( +4 \, \mu\text{C} \) and \( -8 \, \mu\text{C} \) are 40 cm apart. What is the electric field magnitude at a point 20 cm from each charge (forming an equilateral triangle)?

Q9. A charge of \( 3 \, \mu\text{C} \) is enclosed in a cube of edge 15 cm. What is the flux through one face?

Q10. Two charges \( +10 \, \mu\text{C} \) and \( -5 \, \mu\text{C} \) are 50 cm apart. What is the distance from \( +10 \, \mu\text{C} \) where the electric field is zero?

Q11. A point charge \( -3 \, \mu\text{C} \) is at the origin. What is the electric field magnitude at \( x = 3 \, \text{m} \)?

Q12. What is the total charge of a system containing three charges: \( +3 \, \mu\text{C} \), \( -5 \, \mu\text{C} \), and \( +2 \, \mu\text{C} \)?

Q13. A closed surface has a net flux of \( 5.65 \times 10^5 \, \text{Nm}^2/\text{C} \). What is the charge enclosed?

Q14. Two charges \( +8 \, \mu\text{C} \) and \( -2 \, \mu\text{C} \) are 20 cm apart. What is the distance from \( +8 \, \mu\text{C} \) where the electric field is zero?

Q15. A dipole with charges \( +7 \, \mu\text{C} \) and \( -7 \, \mu\text{C} \) separated by 3 mm is in a field \( 4 \times 10^4 \, \text{N/C} \) at 60°. What is the torque?

NEET Physics — Electric Charges and Fields

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Why do electric field lines tend to be closer together near regions of high charge density?

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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 Electric Charges and Fields. It contains 15 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 Electric, Together, Infinite, Material, Magnitude, and Midpoint.

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. Why do electric field lines tend to be closer together near regions of high charge density?

  • A. Charge quantization
  • B. Field strength
  • C. Field symmetry
  • D. Charge mobility

Q2. Why does the electric field near an infinite charged plane not depend on the nature of the material it’s made of?

  • A. Charge quantization
  • B. Field cancellation
  • C. Material symmetry
  • D. Surface charge density

Q3. Two charges \( +9 \, \mu\text{C} \) and \( -3 \, \mu\text{C} \) are 70 cm apart. What is the electric field magnitude at the midpoint?

  • A. \( 8.5 \times 10^5 \, \text{N/C} \)
  • B. \( 8.81 \times 10^5 \, \text{N/C} \)
  • C. \( 9.0 \times 10^5 \, \text{N/C} \)
  • D. \( 9.2 \times 10^5 \, \text{N/C} \)

Q4. Why does an electric dipole experience a torque but no net force when placed in a uniform electric field?

  • A. Charge asymmetry
  • B. Equal and opposite forces
  • C. Field gradient
  • D. Charge quantization

Q5. Why does the electric field due to an electric dipole decrease with distance as \( 1/r^3 \) rather than \( 1/r^2 \) as for a single charge?

  • A. Charge quantization
  • B. Cancellation effect
  • C. Field symmetry
  • D. Increased charge density

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