A straight of length L extends from x=a to x=L+a. the gravitational force it exerts on a point mass 'm' at x=0, if the mass per unit length of the rod is `A+Bx^(2), ` is given by :
A
`Gm[A((1)/(a+L)-(1)/(a))-BL]`
B
`Gm[A((1)/(a)-(1)/(a+L))-BL]`
C
`Gm[A((1)/(a+L)-(1)/(a))+BL]`
D
`Gm[A((1)/(a)-(1)/(a+L))+BL]`
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