1.

A proton is moving away from an electron, then find the change in potential energy of the system.

Answer»

decreases
INCREASES
remains constant
may decrease or increase

Solution :Potential energy of system MADE of proton and election,
`U = (k(E)(-e))/(r) =- (ke^(2))/(r)`
`:.` Negative VALUE of U decreases with increase in r.
Hence potential energy increases .


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