NEET Physics: Electric Charges and Fields — MCQ Test 7

Q6. Which principle explains why rubbing two neutral objects can result in one becoming positively charged and the other negatively charged?

Q7. What allows the electric field to be discontinuous across a charged surface, such as a conductor’s boundary?

Q8. A thin spherical shell of radius 20 cm has a charge of \( 14 \, \mu\text{C} \). What is the electric field at a point 25 cm from the center?

Q9. A conducting sphere of radius 10 cm has a surface charge density of \( 20 \, \mu\text{C/m}^2 \). What is the electric field just outside its surface?

Q10. Two charges \( +3 \, \mu\text{C} \) and \( -3 \, \mu\text{C} \) are 15 cm apart. What is the force on a \( 2 \, \mu\text{C} \) charge placed at the midpoint?

Q11. Three charges \( +q, +q, -q \) are at the vertices of an equilateral triangle of side 3 m. What is the net force magnitude on \( +q \) at one vertex?

Q12. A charge of \( 8 \, \mu\text{C} \) is at the center of a cube of edge 25 cm. What is the total flux through the cube?

Q13. A charge of \( 4 \, \mu\text{C} \) is placed at the center of a cube of edge 10 cm. What is the electric flux through one face?

Q14. A uniform field \( E = 9 \times 10^3 \, \text{N/C} \) is along the x-axis. What is the flux through a rectangle of 15 cm × 20 cm in the yz-plane?

Q15. A dipole with \( p = 7 \times 10^{-9} \, \text{C m} \) is at 45° to a field \( E = 9 \times 10^4 \, \text{N/C} \). What is the torque?

NEET Physics — Electric Charges and Fields

Free MCQ Test 7 of 22

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Medium

Two charges \( +12 \, \mu\text{C} \) and \( -4 \, \mu\text{C} \) are 90 cm apart. What is the distance from \( +12 \, \mu\text{C} \) where the electric field is zero?

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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 Distance, Electric, Infinite, Uniformly, Compared, and Principle.

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 \( +12 \, \mu\text{C} \) and \( -4 \, \mu\text{C} \) are 90 cm apart. What is the distance from \( +12 \, \mu\text{C} \) where the electric field is zero?

  • A. 55 cm
  • B. 56 cm
  • C. 56.5 cm
  • D. 57 cm

Q2. A dipole with \( p = 5 \times 10^{-9} \, \text{C m} \) is at 90° to a field \( E = 5 \times 10^4 \, \text{N/C} \). What is the torque?

  • A. \( 2.2 \times 10^{-4} \, \text{N m} \)
  • B. \( 2.3 \times 10^{-4} \, \text{N m} \)
  • C. \( 2.4 \times 10^{-4} \, \text{N m} \)
  • D. \( 2.5 \times 10^{-4} \, \text{N m} \)

Q3. An infinite line charge has \( \lambda = 8 \times 10^{-7} \, \text{C/m} \). What is the electric field at 20 cm?

  • A. \( 6.5 \times 10^4 \, \text{N/C} \)
  • B. \( 7.2 \times 10^4 \, \text{N/C} \)
  • C. \( 7.5 \times 10^4 \, \text{N/C} \)
  • D. \( 8.0 \times 10^4 \, \text{N/C} \)

Q4. Two charges \( +14 \, \mu\text{C} \) and \( -6 \, \mu\text{C} \) are 100 cm apart. What is the distance from \( +14 \, \mu\text{C} \) where the electric field is zero?

  • A. 56 cm
  • B. 57 cm
  • C. 58 cm
  • D. 58.3 cm

Q5. Why does the electric field due to a uniformly charged wire drop off more slowly with distance compared to a point charge?

  • A. Charge quantization
  • B. Field symmetry
  • C. Linear distribution
  • D. Charge density

+ 10 more questions in the actual test

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