Question

A.)As an electron moves through a region of space, its speed decreases from 9.60 × 10⁶ m/s to 2.40 × 10⁶ m/s. The electric force is the only force acting on the electron.

Which of the following statements is correct about the movement of the electron?

• The electron moves in the direction of potential increase.

• The electron moves to a higher potential.

• The electron moves in the direction of potential increase; that is, to a higher potential.

• The electron moves to a lower potential.

In a region where there is an electric field, the electric forces do +2.20 × 10⁻¹⁹ J of work on an electron as it moves from point X to point Y.

B.)Which of the following is correct about the potential at point X or Y?

X is at the higher potential.

• Y is at the higher potential.

• Both X and Y are at the same potential.

• Y is at the lower potential.

Answer 1

(A) Since the speed of the electron is decreasing, it must be moving in the direction of electric field, such that electric force is opposite in direction to its velocity. Therefore, electron is moving in the direction of decrese of potential.

Answer:

(B) Since electric force does positive work on negatively charged electron, electron must be moved in opposite direction to the electric field, such that it moves from low to high potential

Answer: Y is at higher potential