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Notion of Positive and Negative Potential Energy

If the Change...

Question

If the Change in Potential energy of a system of charges is negative then the system has a tendency to come closer and if the Change in Potential energy of a system of charges is positive then the system has a tendency to move apart.

A

True

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B

False

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Solution

The correct option is B False
The tendency of a system of charges to move closer together or move apart is irrespective of any change in potential energy caused by an external agent. A system of 2 unlike charges will always tend to come closer no matter what an external agent does to its potential energy.

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Q. If the Change in Potential energy of a system of charges is negative then the system has a tendency to come closer and if the Change in Potential energy of a system of charges is positive then the system has a tendency to move apart.

Q. Work done by a conservative force is equal to negative change in the potential energy of the system.

Q_{1}

Q_{2}

are as shown in the figure. A third charge

Q_{3}

is moved from points A to B along a circular path. Change in potential energy of the system is

Q. Which of the following quantities does not depend on the choice of zero potential or zero potential energy?
(a) Potential at a point
(b) Potential difference between two points
(c) Potential energy of a two-charge system
(d) Change in potential energy of a two-charge system

q_{1}

q_{2}

30 c m

apart as shown. A third charge

q_{3}

is moved along the circle of radius

40 c m

C

D

. The change in the potential energy of the system is

\frac{q_{3} K}{4 π ϵ_{0}}

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