There is a heap of sand... coefficient of friction is r... what is the maximum slope of the heap? some thing like this... or may be height.. i think same difference... u know one u know both ...
Two Uniformly Charged Rings are placed co-axially, at a seperation d, one with +Q and the other with -Q, then find the value of electric field at a point on the axis, as a function of x, where x is the ditsnce frm the ring ch ...
