- #1

jtran06

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## Homework Statement

Two half-rings of charge of opposite polarity are brought together at the origin (so that the rings create a full circle against the y- and z-axis. Each half-ring has a charge of magnitude

*Q*and radius

*a*. Derive the net electric field at point P, located on the +x axis a distance

*d*from the centre of the two half-rings.

## Homework Equations

Not sure.

## The Attempt at a Solution

I really have no idea how to work this out from what we learned in lecture; "electric field of a ring of charge".. Help, please!