The gravitational field due to a mass distribution is given by , where k is a constant. Assuming the potential to be zero at infinity, find the potential at a point x = a. [This question is only for Dropper and XII batch]

1. $\frac{k}{{a}^{2}}$

2. $\frac{-k}{{a}^{2}}$

3. $\frac{k}{a}$

4. $\frac{-k}{a}$

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