Which one of the following statements is true concerning the work done by an ext

Question

Which one of the following statements is true concerning the work done by an external force in moving an electron at constant speed between two points in an electrostatic field? The work done is always zero joules. The work done Is always positive. The work done only depends on the speed of the electron. The work depends on the total distance covered. The work done depends only on the displacement of the electron. Complete the following statement: The electron volt is a unit of energy. electric field strength. electric force. Electric potential difference. electric power. Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electro static field Work must be done to bring two positive charges closer together. Like charges repel one another and unlike charges attract one another. A positive charge will gain kinetic energy as it approaches a negative charge. The work re

Explanation / Answer

Q6.

when the electron is moving at constant speed, net work done by Electrostatic force and external force is zero. Electrostatic force is conservative, that is work done by electrostatic force is independent of path and depends only on displacement. Since work done by external force is negative of work done by electrostatic force, work done by external force is also independent of path and depends only on displacement. answer is E

Q7.

electron volt is a unit of Energy It is the work done to move an electron through a potential difference of one Volt.

answer is A

Q8

To define a potential of a field, the work done by the force of the field must be independent of path taken.

This is true in case of electrostatic field. answer is D

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