Waec Model Questions Vol1 2019 Physics Question 19

Practice objective / multiple choice question 19 from the 2019 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 19 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

Two point charges are placed on the y‑axis: a charge +Q at the origin and a charge -2Q at the point (0, a). Determine the magnitude and direction of the resultant electric field at point P (a, 0). Express the magnitude in terms of k, Q and a, and give the direction as the angle measured counter‑clockwise from the positive x‑axis.

Answer Options

A. Magnitude = (kQ\/a^2)·√(2+√2); Direction = 45° above the +x‑axis (tanθ = 1)
B. Magnitude = (kQ\/a^2)·√(3‑√2); Direction = 60° above the +x‑axis (tanθ = √3)
C. Magnitude = (kQ\/a^2)·√(2‑√3); Direction = 75° above the +x‑axis (tanθ = 2+√3)
Correct Answer D. Magnitude = (kQ/a^2)·√(2‑√2); Direction = 67.5° above the +x‑axis (tanθ = 1+√2)
Correct Answer
D
Correct Option:
Magnitude = (kQ/a^2)·√(2‑√2); Direction = 67.5° above the +x‑axis (tanθ = 1+√2)

About This Question

This is Waec Model Questions Vol1 2019 Physics Question 19. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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