Neco Model Questions Vol1 2021 Physics Question 32

Practice objective / multiple choice question 32 from the 2021 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 32 NECO_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A proton (charge \(+e\), mass \(m_{p}=1.67\times10^{-27}\) kg) is accelerated from rest through a potential difference of \(500\) V and then enters a uniform magnetic field of magnitude \(B=0.02\) T directed into the page. The velocity of the proton makes an angle of \(30^{\circ}\) with the magnetic field direction. Determine (a) the speed of the proton after acceleration, (b) the radius of the helical path followed in the magnetic field, (c) the pitch (distance between successive turns) of the helix, and (d) the time required for the proton to complete one full turn.

Answer Options

A. v = 1.20×10⁷ m/s; r = 2.10 mm; pitch = 1.90 cm; period = 2.00 ns
B. v = 1.33×10⁷ m/s; r = 2.30 mm; pitch = 2.50 cm; period = 2.10 ns
Correct Answer C. v = 1.33×10⁷ m/s; r = 1.89 mm; pitch = 2.06 cm; period = 1.79 ns
D. v = 1.45×10⁷ m/s; r = 1.70 mm; pitch = 2.20 cm; period = 1.60 ns
Correct Answer
C
Correct Option:
v = 1.33×10⁷ m/s; r = 1.89 mm; pitch = 2.06 cm; period = 1.79 ns

About This Question

This is Neco Model Questions Vol1 2021 Physics Question 32. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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