A proton and an electron enter a uniform magnetic field with same velocity perpendicular to field. Which has larger radius? MCQ with Answer and Explanation

Question Report Error

A proton and an electron enter a uniform magnetic field with same velocity perpendicular to field. Which has larger radius?

A. Electron

B. Same

C. Depends on charge

D. Proton

Answer: Option D

Solution (By JKExamLibrary)

r = mv/(qB). Proton mass >> electron mass, so radius larger.

This question belongs to: Science Physics

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1 Report Error

Carnot efficiency η = 1 - T₂/T₁. If T₁=600K, T₂=300K, η is:

A. 25%

B. 75%

C. 50%

D. 100%

View Answer & Solution Discuss

Correct Answer: Option C

Explanation:
η = 1 - 300/600 = 1 - 0.5 = 0.5 = 50%. Maximum possible efficiency for given temperatures. Memory aid: 'η_Carnot = 1 - T_cold/T_hot; always < 100%'. Thermodynamics calculation frequently tested in competitive exams.

This question belongs to: Science Physics

Question #2 Report Error

The unit of latent heat is

A. J

B. J/kg

C. W

D. J/°C

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Latent heat per unit mass, so Q = mL, L = Q/m, unit J/kg (or cal/g). Specific latent heat of fusion/vaporization. Heat required for phase change without temperature change.

This question belongs to: Science Physics

Question #3 Report Error

Capacitor charging work stored as:

A. Magnetic energy

B. Electrostatic energy

C. Heat

D. Chemical energy

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Work done stored in electric field between plates: U = ½CV². Recoverable on discharge. Memory aid: 'Capacitor energy = ½CV² in electric field'. Electrostatics concept frequently tested in competitive exams.

This question belongs to: Science Physics

Explore All Physics MCQs