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## Homework Statement

5 point charges;

q1; charge = +q distance = d

q2; charge = +2q distance = 3d

q3; charge = -3q distance = 2d

q4; charge = -4q distance = 3d

q5; charge = -5q distance = 2d

are placed in the vicinity of an insulating spherical shell with a charge (+Q), distributed uniformly over its surface.

Rank the point charges in order of the increasing magnitude of force exerted on them by the sphere. Indicate all ties where appropriate. Show all calculations of force.

(there is a diagram attached, but I don't have a scanner and my teacher siad it is only to visualise the problem.)

## Homework Equations

Coulomb's law;

F= K (q1)(q2)

--------

r squared

## The Attempt at a Solution

My teacher said to apply coulombs law to each of the charges, than compare each.

I tried this, but have no idea of what values I should use for q1 and which I should use for q2.

And do I need the distance of each charge from the edge of the sphere?

The more I look at it, the less sense it makes.