Pretest: Electric potential difference 135 Two charges +Q, and -Q, are fixed i F

Question

Pretest: Electric potential difference 135 Two charges +Q, and -Q, are fixed i Four points A, B, C, and D are labeled on the diagram place at the positions shown -0 1. Sketch arrows on the diagram to indicate the direction of the electric field, if any, at each of the points A, B, C, and D 2. A positively charged test particle is observed to move as described below. For each motion, tell whether the work done by the electric field is positive, negative, or zero. Explain your reasoning in each case the test charge moves from point B to point A the test charge moves from point B to point C the test charge moves from point B to point D 3. Rank, from highest to lowest, the electric potentials at points A. B, C, and D. Explain. Tutorials in Introductory Physics McDermott, Shaffer, and P.EG., U. Wash Prentice Hall, Inc First Edition, 2003

Explanation / Answer

. directin of field is also along B to A.

and charge is positibe hence force is also B to A.

displacement and force are in same direction.

hence work done is positive.

. now displacement and force are in opposite direction,.

Work done is negative.

. force is upward and displacement is to the right.

force and displacement are perpendicular.

so work done is zero.

3. at A potential is negative.

at B, potential is zero.

at C,potential is positive.

at D, potential is zero.

C > BN = D > A

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