The figure below shows some measurements of the electric field produced by four

Question

The figure below shows some measurements of the electric field produced by four charges (A, B, C, and D) and measured by a negative test charge. Circle the correct answers.

1. Which of the following statements are true about these charges?

a) Charges A and D are positive.

b) Charges B and C are positive.

c)  All the charges are of equal magnitude.

d) You can't conclude anything about the charges.

Which of the following graphs represents the electric potential along the dotted line (x axis)? (Choose N if none of these graphs are correct.)

Explanation / Answer

As per the figure, the direction is always represented from positive to negative, as such, the options a and b are correct. (The lines from A & D are shown away from them, which means they are positive, where as, the lines towards B & C indicate that they are negative.

a) Charges A and D are positive.

b) Charges B and C are positive.

As per the definition of electric potential, V = Ed, which means electric potential is proportional to Electric field, which is shown from positive to negative, thus, option A is correct.

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