[" 5.The gravitational field due to a certain mass distribution is "E=(K)/(x^(3))" in the x-direction (K is a constar) "],[" the gravitational potential to be zero at infinity,its value corresponding to distance "x" is :- "],[[" (A) "(K)/(x)," (B) "(K)/(2x)],[" 6.Two bodies of respective masses "m" and "M" are placed d distance apart.The gravitational pot "],[" the position where the gravitational field due to them is zero is :- "]]