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## Homework Statement

Show that the gravitational field due to thin uniform circular plate of radius a at point distant R from center and on the axis passing through the center and perpendicular to the plane of the plate is given by E= -2πGρ[1-R/(a^2+R^2)^1/2]

## Homework Equations

F= GMm/r^2

E=F/m

## The Attempt at a Solution

I really don't have any proper approach as to how I should go about this problem. How am I going to get a negative sign in the field created by the plate making sure the field is on the vertical axis passing through the center??? Would be very helpful if any of you could drop a hint as to how I should start this problem as I am at a total loss with this one.