Recent content by rohitr30

The unit vector is (-i-2j)/(sqrt(5)...the negative direction as the point given is on the same side as origin and direction of filed lines reverse...if only i had the ability to post a diagram on these threads :(

You first need to understand that the plane containing the charges is an infinite plane.construct a gaussian pillbox and determine the direction of electric field.the pillbox is a right circular cylinder with it's axis perpendicular to the required plane.By symmetry,the field lines to this...

Hint: You use keplers third law where (time period)^2= (radius of orbit)^3