waec model questions vol1 2021 physics
Objective • Question 9
Question 9
WAEC_MODEL_QUESTIONS_VOL1
•
2021
Two point charges are placed on the y‑axis: a +8 µC charge at the origin O and a -2 µC charge at point A (0, 0.12 m). (a) Determine the magnitude and direction of the net electric field at point P (0.08 m, 0). (b) A test charge of +1 µC is moved from P to point Q (0, 0.20 m) along a straight line. Calculate the work done by the electric field on the test charge during this displacement. (c) Find the electric potential difference V_P - V_Q.
Answer Options
A.
E ≈ 1.15×10⁷ N C⁻¹ at 2.1° above +x; work = 0.72 J; V_P‑V_Q = 6.90×10⁵ V
B.
E ≈ 9.5×10⁶ N C⁻¹ at 5.2° above +x; work = 0.55 J; V_P‑V_Q = 5.80×10⁵ V
Correct Answer
C.
E ≈ 1.08×10⁷ N C⁻¹ at 3.8° above +x; work = 0.64 J; V_P‑V_Q = 6.40×10⁵ V
D.
E ≈ 1.02×10⁷ N C⁻¹ at 4.5° above +x; work = 0.60 J; V_P‑V_Q = 6.20×10⁵ V
Correct Answer
C
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.
Unlock Full Access
Available for Android & Windows