Waec Model Questions Vol1 2021 Physics Question 39

Practice objective / multiple choice question 39 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 39 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

An electron is accelerated through a potential difference of 500 V and then enters a region where a uniform magnetic field $B_{1}=2.0\times10^{-3}\ \text{T}$ is present. Inside this region a long solenoid of length $0.30\ \text{m}$ with 500 turns carries a current $I$ so that its field $B_{2}$ is parallel to $B_{1}$. The total magnetic field causes the electron to move in a circular path of radius $2.0\ \text{cm}$, perpendicular to the field. (a) Find the current $I$ in the solenoid. (b) State the total magnetic field magnitude. (c) Compute the magnetic force acting on the electron.

Answer Options

Correct Answer A. (a) 0.85 A; (b) 3.77×10⁻³ T; (c) 8.0×10⁻¹⁵ N
B. (a) 1.10 A; (b) 4.20×10⁻³ T; (c) 9.5×10⁻¹⁵ N
C. (a) 0.70 A; (b) 3.50×10⁻³ T; (c) 7.2×10⁻¹⁵ N
D. (a) 0.95 A; (b) 3.90×10⁻³ T; (c) 8.5×10⁻¹⁵ N
Correct Answer
A
Correct Option:
(a) 0.85 A; (b) 3.77×10⁻³ T; (c) 8.0×10⁻¹⁵ N

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 39. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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