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## Homework Statement

A stationary particle of charge q = 3.0 10-8 C is placed in a laser beam whose intensity is 2.5 103 W/m2.(a) Determine the magnitude of the electric force exerted on the charge.

(b) Determine the magnitude of the magnetic force exerted on the charge.

## Homework Equations

Force on a charge--> F=qE

S = cu

u = (1/2)εo*E^2

## The Attempt at a Solution

a.) i am given S and i know c so i can find u by S/c = u.

now that i have u i can solve for E using u = (1/2)εo*E^2.

I multiply E times q to get F.

sounds easy enough and makes sense to me, however i am doing something wrong here huh?

b.) i know that the magnitude will be zero since the charge is stationary.