On the x -axis and at a distance x from the origin, the gravitational field due to a mass distribution is given by(x2+a2)3/2Axin the x -direction. The magnitude of gravitational potential on the x -axis at a distance x , taking its value to be zero at infinity, is :
a. (x2+a2)1/2A
b. (x2+a2)3/2A
c. A(x2+a2)1/2
d. A(x2+a2)3/2