Assertion(A): In bringing an electron towards a proton electrostatic potential energy of the system decreases.
Reason (R): Potential due to proton is positive.

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

answer is B.

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Detailed Solution

$U = - \frac{{ke}^{2}}{r}$

As r decreases , magnitude of U increases, but U decreases.

$V_{P} = \frac{ke}{r} \geq 0$

Both (A) and (R) are true and (R) is not the correct explanation of (A).

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