Gce Model Questions Vol1 2018 Physics Question 24

Practice objective / multiple choice question 24 from the 2018 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2018 Physics Objective / Multiple Choice Hard Difficulty
Question 24 GCE_MODEL_QUESTIONS_VOL1 • 2018 • PHYSICS • objective

Three point charges are placed at the vertices of a right‑angled triangle \(ABC\) with \(\angle ABC = 90^{\circ}\). The sides are \(AB = 0.20\ \text{m}\), \(BC = 0.15\ \text{m}\) and \(AC\) is the hypotenuse. The charges are \(q_{1}=+5\ \mu\text{C}\) at \(A\), \(q_{2}=-3\ \mu\text{C}\) at \(B\) and \(q_{3}=+2\ \mu\text{C}\) at \(C\).\n\n(a) Find the magnitude and direction of the net electric field at the midpoint \(M\) of side \(AC\).\n\n(b) A test charge \(q_{t}=+1\ \mu\text{C}\) is moved quasistatically from \(M\) to the midpoint \(D\) of side \(BC\). Calculate the work done by the external agent in this process.\n\n(c) The whole configuration is rotated through \(180^{\circ}\) about the midpoint of \(BC\). How does the magnitude of the electric field at the new position of \(M\) compare with that found in part (a)?

Answer Options

A. |E| = 3.10\times10^{6}\ \text{N\,C}^{-1} \text{ (upward)}, \; W = 0.20\ \text{J}, \; the magnitude after rotation is increased (3.10\times10^{6}\ \text{N\,C}^{-1})
B. |E| = 2.50\times10^{6}\ \text{N\,C}^{-1} \text{ (downward)}, \; W = -0.15\ \text{J}, \; the magnitude after rotation is unchanged (2.50\times10^{6}\ \text{N\,C}^{-1})
Correct Answer C. |E| = 2.76\times10^{6}\ \text{N\,C}^{-1} \text{ (downward)}, \; W = -0.20\ \text{J}, \; the magnitude after rotation is unchanged (2.76\times10^{6}\ \text{N\,C}^{-1})
D. |E| = 2.76\times10^{6}\ \text{N\,C}^{-1} \text{ (downward)}, \; W = -0.20\ \text{J}, \; the magnitude after rotation is halved (1.38\times10^{6}\ \text{N\,C}^{-1})
Correct Answer
C
Correct Option:
|E| = 2.76\times10^{6}\ \text{N\,C}^{-1} \text{ (downward)}, \; W = -0.20\ \text{J}, \; the magnitude after rotation is unchanged (2.76\times10^{6}\ \text{N\,C}^{-1})

About This Question

This is Gce Model Questions Vol1 2018 Physics Question 24. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

View More Gce Model Questions Vol1 2018 Physics Questions More Gce Model Questions Vol1 Practice Questions Back to Questions

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
Chat with Support