Neco Model Questions Vol1 2023 Physics Question 29

Practice objective / multiple choice question 29 from the 2023 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2023 Physics Objective / Multiple Choice Hard Difficulty
Question 29 NECO_MODEL_QUESTIONS_VOL1 • 2023 • PHYSICS • objective

Two point charges are fixed on the x‑axis: a charge \(+Q\) at \(x=-a\) and a charge \(-2Q\) at \(x=2a\). A third charge \(q\) is placed somewhere on the x‑axis where the net electric force on it is zero.\n\n(a) Find the position \(x\) (in terms of \(a\)) where \(q\) can be placed.\n(b) If \(q=+Q\), determine the electric potential at that point due to the two fixed charges, expressing your answer in terms of \(k\), \(Q\) and \(a\).

Answer Options

A. (a) x = -a\,(3+4\sqrt{2})\;\;(b) V = \frac{kQ}{3a}\,(2\sqrt{2}-2)
B. (a) x = -a\,(4-3\sqrt{2})\;\;(b) V = \frac{kQ}{3a}\,(2\sqrt{2}+3)
C. (a) x = a\,(4+3\sqrt{2})\;\;(b) V = \frac{kQ}{3a}\,(3-2\sqrt{2})
Correct Answer D. (a) x = -a\,(4+3\sqrt{2})\;\;(b) V = \frac{kQ}{3a}\,(2\sqrt{2}-3)
Correct Answer
D
Correct Option:
(a) x = -a\,(4+3\sqrt{2})\;\;(b) V = \frac{kQ}{3a}\,(2\sqrt{2}-3)

About This Question

This is Neco Model Questions Vol1 2023 Physics Question 29. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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