A straight rod of length L extends from x= a to x=L+ a. The gravitational force it exerts on a po...

A straight rod 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+B x^2, is given by:
[JEE Main - 2019 (January)]
(1) Gm[A(1/a+L-1/a)-BL]
(2) G m[A(1/a-1/a+L)-B L]
(3) Gm[A(1/a+L-1/a)+BL]
(4) G m[A(1/a-1/a+L)+B L]

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