Chapter Exam

Chapter 7: Moving Charges and Magnetism — Online MCQ Test

Q: What is the SI unit of magnetic field strength (magnetic induction)?

Answer: A. Tesla — The SI unit of magnetic induction (B) is the Tesla (T).

Q: The magnetic force on a charge q moving with velocity v in a magnetic field B is given by:

Answer: B. F = q(v × B) — The Lorentz magnetic force is defined by the cross product F = q(v × B).

Q: The magnetic field at the center of a circular current-carrying loop of radius R is:

Answer: A. μ₀I / 2R — Applying the Biot-Savart law for a full circular loop yields B = μ₀I / 2R.

Q: A charge particle enters a uniform magnetic field at an angle of 30 degrees. The path traced by the particle is:

Answer: C. Helical — When velocity makes an angle with the B-field, the perpendicular component causes circular motion and parallel component keeps it moving, resulting in a helix.

Q: In a cyclotron, if the radius of the dees is doubled, the maximum kinetic energy of the accelerated particle will be:

Answer: B. Four times — Kinetic Energy is proportional to R² (since v = qBR/m). Doubling R increases KE by 4.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 7: Moving Charges and Magnetism with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. This chapter covers: Focusing on electromagnetism this chapter details Biot-Savart Law Ampere Circuital Law magnetic forces cyclotron motion force on current-carrying conductors and moving coil galvano.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Moving Charges and Magnetism — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 7: Moving Charges and Magnetism, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of magnetic field strength (magnetic induction)?

A. Tesla ✓
B. Weber
C. Ampere
D. Henry

Answer: A. Tesla
The SI unit of magnetic induction (B) is the Tesla (T).

The magnetic force on a charge q moving with velocity v in a magnetic field B is given by:

A. F = q(v · B)
B. F = q(v × B) ✓
C. F = q(B × v)
D. F = q(v + B)

Answer: B. F = q(v × B)
The Lorentz magnetic force is defined by the cross product F = q(v × B).

The magnetic field at the center of a circular current-carrying loop of radius R is:

A. μ₀I / 2R ✓
B. μ₀I / R
C. μ₀I / 4R
D. 2μ₀I / R

Answer: A. μ₀I / 2R
Applying the Biot-Savart law for a full circular loop yields B = μ₀I / 2R.

A charge particle enters a uniform magnetic field at an angle of 30 degrees. The path traced by the particle is:

A. Straight line
B. Circular
C. Helical ✓
D. Parabolic

Answer: C. Helical
When velocity makes an angle with the B-field, the perpendicular component causes circular motion and parallel component keeps it moving, resulting in a helix.

In a cyclotron, if the radius of the dees is doubled, the maximum kinetic energy of the accelerated particle will be: