- #1

- 13

- 0

## Homework Statement

[/B]

Derive expressions for the magnitude and direction of the electric field at point P and the potential

at R.

Charges Q1 and Q2 are both positive.

Distance from Q1 to P is h, distance from Q2 to P is √2 h

## Homework Equations

E = k q/r^2

## The Attempt at a Solution

I started with finding E field at point P for each of the 2 charges, giving:

E1 = k Q1/h^2

E2 = k Q2/2h^2

Then separate into x and y components.

For E1, the x component is 0, and the y component is just the total E1.

For E2, the x component is E2 * cos45 , and the y component is E2 * sin45. (I think.)

Is it okay to give the answer as just (magnitude) x direction + (magnitude) y direction ?

Or should the answer be given as just 1 number for magnitude, and one angle for direction? Wouldn't this give some horrible expression?