Question

Electric field related questions

Answer 1

Question:

Three identical point charges of magnitude +1.0mC are located at the corners of a square that is 1.m on a side. A point charge of magnitude -1.5mC is placed at the remaining corner.

1) What is the magnitude of the force acting on the negative point charge?

2) What is the electric field strength at a point halfway between two adjacent positive charges?

3) What is the size of the force acting on one of the positive charges adjacent to the negative charge?

4) What is the electric field strength at the center of the square? Please help by showing work.

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Answer 2

Explanation:

1. In Fig.1.1, two positive charges q2 and q3 fixed along the y axis, exert a net electric force in the + x direction on a charge q1 fixed along the x axis. If a positive charge Q is added at (x, 0), the force on q1.

(a) shall increase along the positive x-axis.

(b) shall decrease along the positive x-axis.

(c) shall point along the negative x-axis.

(d) shall increase but the direction changes because of the intersection of Q with q2 and q3.

2.A point positive charge is brought near an isolated conducting sphere (Fig. 1.2). The electric field is best given by

(a) Fig (i)

(b) Fig (ii)

(c) Fig (iii)

(d) Fig (iv)

3.The Electric flux through the surface

(a) in Fig.1.3 (iv) is the largest.

(b) in Fig. 1.3 (iii) is the least.

(c) in Fig. 1.3 (ii) is same as Fig. 1.3 (iii) but is smaller than Fig. 1.3 (iv)

(d) is the same for all the figures

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