NEET Physics: Electric Charges and Fields — MCQ Test 4

Q6. Three charges \( +7 \, \mu\text{C}, -5 \, \mu\text{C}, +3 \, \mu\text{C} \) are at the vertices of an equilateral triangle of side 2 m. What is the force magnitude on \( +7 \, \mu\text{C} \)?

Q7. A thin spherical shell of radius 30 cm has a charge of \( 18 \, \mu\text{C} \). What is the electric field at a point 36 cm from the center?

Q8. A charge of \( 5 \, \mu\text{C} \) is enclosed in a cube of edge 30 cm. What is the flux through one face?

Q9. An infinite line charge has a linear charge density \( \lambda = 2 \times 10^{-6} \, \text{C/m} \). What is the electric field at 5 cm from the wire?

Q10. Why does the electric field inside a charged insulator depend on the distribution of charges within it?

Q11. A uniform field \( E = 8 \times 10^3 \, \text{N/C} \) is along the y-axis. What is the flux through a circle of radius 15 cm in the xz-plane at 30° to the y-axis?

Q12. What fundamental concept explains why the electric field just outside a charged conductor is perpendicular to its surface?

Q13. A charge of \( -2 \, \mu\text{C} \) produces a flux of \( -2.26 \times 10^5 \, \text{Nm}^2/\text{C} \) through a spherical surface. What is the radius of the surface?

Q14. Two charges \( +5 \, \mu\text{C} \) and \( -5 \, \mu\text{C} \) are 30 cm apart. What is the potential energy of the system?

Q15. A thin spherical shell of radius 11 cm has \( q = 5 \, \mu\text{C} \). What is the electric field at 9 cm from the center?

NEET Physics — Electric Charges and Fields

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How many electrons must be added to a neutral body to give it a charge of \( -8 \times 10^{-8} \, \text{C} \)?

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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 Electrons, Conducting, Electric, Separated, Parallel, and Coordinate.

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. How many electrons must be added to a neutral body to give it a charge of \( -8 \times 10^{-8} \, \text{C} \)?

  • A. \( 4 \times 10^{11} \)
  • B. \( 5 \times 10^{11} \)
  • C. \( 6 \times 10^{11} \)
  • D. \( 7 \times 10^{11} \)

Q2. A conducting sphere of radius 14 cm has an electric field of \( 7 \times 10^3 \, \text{N/C} \) at 28 cm from its center. What is the charge?

  • A. \( 5.8 \times 10^{-8} \, \text{C} \)
  • B. \( 5.9 \times 10^{-8} \, \text{C} \)
  • C. \( 6.0 \times 10^{-8} \, \text{C} \)
  • D. \( 6.1 \times 10^{-8} \, \text{C} \)

Q3. A dipole with charges \( +2 \, \mu\text{C} \) and \( -2 \, \mu\text{C} \) separated by 1 mm is in a field of \( 6 \times 10^4 \, \text{N/C} \) at 90°. What is the torque?

  • A. \( 1.0 \times 10^{-4} \, \text{N m} \)
  • B. \( 1.2 \times 10^{-4} \, \text{N m} \)
  • C. \( 1.5 \times 10^{-4} \, \text{N m} \)
  • D. \( 1.8 \times 10^{-4} \, \text{N m} \)

Q4. A uniform field \( E = 5 \times 10^3 \, \text{N/C} \) is along the x-axis. What is the net flux through a cube of side 30 cm with faces parallel to coordinate planes?

  • A. \( 0 \, \text{Nm}^2/\text{C} \)
  • B. \( 450 \, \text{Nm}^2/\text{C} \)
  • C. \( 900 \, \text{Nm}^2/\text{C} \)
  • D. \( 1350 \, \text{Nm}^2/\text{C} \)

Q5. A plane sheet has \( \sigma = 5.31 \times 10^{-11} \, \text{C/m}^2 \). What is the electric field near it?

  • A. \( 2.5 \, \text{N/C} \)
  • B. \( 3.0 \, \text{N/C} \)
  • C. \( 3.5 \, \text{N/C} \)
  • D. \( 4.0 \, \text{N/C} \)

+ 10 more questions in the actual test

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