Neco Model Questions Vol1 2020 Physics Question 28

Practice objective / multiple choice question 28 from the 2020 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2020 Physics Objective / Multiple Choice Hard Difficulty
Question 28 NECO_MODEL_QUESTIONS_VOL1 • 2020 • PHYSICS • objective

A uniform magnetic field of magnitude \(B = 0.8\ \text{T}\) is directed into the page. A proton enters the field region moving in the plane of the page and follows a circular path of radius \(r = 0.05\ \text{m}\).\n\n(a) Find the speed of the proton.\n(b) The proton then enters a region where a uniform electric field of magnitude \(E = 1.2\times10^{4}\ \text{V m}^{-1}\) is applied perpendicular to the magnetic field (still into the page) and also perpendicular to the proton's velocity at the entry of that region. Determine the magnitude of the net force on the proton in this region and the radius of its new curved trajectory.\n(c) If the proton's speed is adjusted so that it moves undeflected through the combined fields, what speed must it have?

Answer Options

Correct Answer A. a) 3.83\times10^{6}\ \text{m s}^{-1}; b) F_{net}=4.91\times10^{-13}\ \text{N}, r'\approx5.0\times10^{-2}\ \text{m}; c) 1.5\times10^{4}\ \text{m s}^{-1}
B. a) 3.0\times10^{6}\ \text{m s}^{-1}; b) F_{net}=3.9\times10^{-13}\ \text{N}, r'\approx6.0\times10^{-2}\ \text{m}; c) 1.0\times10^{4}\ \text{m s}^{-1}
C. a) 4.2\times10^{6}\ \text{m s}^{-1}; b) F_{net}=5.2\times10^{-13}\ \text{N}, r'\approx4.5\times10^{-2}\ \text{m}; c) 1.2\times10^{4}\ \text{m s}^{-1}
D. a) 3.5\times10^{6}\ \text{m s}^{-1}; b) F_{net}=4.0\times10^{-13}\ \text{N}, r'\approx5.5\times10^{-2}\ \text{m}; c) 2.0\times10^{4}\ \text{m s}^{-1}
Correct Answer
A
Correct Option:
a) 3.83\times10^{6}\ \text{m s}^{-1}; b) F_{net}=4.91\times10^{-13}\ \text{N}, r'\approx5.0\times10^{-2}\ \text{m}; c) 1.5\times10^{4}\ \text{m s}^{-1}

About This Question

This is Neco Model Questions Vol1 2020 Physics Question 28. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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