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Short answer·Standard multi-step (3/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A proton enters a uniform magnetic field of 0.20 T0.20\text{ T} at right angles with speed 4.8×105 m s−14.8\times10^5\text{ m s}^{-1}. Use mp=1.67×10−27 kgm_p=1.67\times10^{-27}\text{ kg} and q=1.6×10−19 Cq=1.6\times10^{-19}\text{ C}.
Total: 4 marks

(a) Find the radius of the circular path. (2 marks)

(b) Find the time period of revolution. (2 marks)

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cbse-physics-12.u3.t3-2.saq.002

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