Question

A proton moves a distance d in a uniform electric field $\overset{\rightarrow}{E}$ as shown in the figure. Does the electric field do a positive or negative work on the proton? Does the electric potential energy of the proton increase or decrease?

• A. Negative, increase
• B. Positive, decrease
• C. Negative, decrease
• D. Positive, increase

Answer 1

Answer: (A)

Negative, increase

Answer 2

+ve charge moves in the direction of field, but here it is moved opposite to the field, \ work is to be done by external source.

W_electric = – ve, Potential energy increase.