Which one of the following statements is true concerning thework done by an exte

Question

Which one of the following statements is true concerning thework done by an external force in moving an electron at constantspeed between two points in an electrostatic field?

a. It is always zerojoules.
b. It depends on the total distancecovered.
c. It is always positive.
d. It depends only on the displacementof the electron.
e. It is always negative. Which one of the following statements is true concerning thework done by an external force in moving an electron at constantspeed between two points in an electrostatic field? It is always zerojoules. It depends on the total distancecovered. It is always positive. It depends only on the displacementof the electron. It is always negative.

Explanation / Answer

   It depends only on the displacement of theelectron.    Workdone   =   F * d    for givenfield   F   =   e *E,   is constant hence work done will only dependupond, displcement.

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