16.5 Exercise 42

Use the Appendix D for the next two exercises

Electromagnetic radiation from a 5.00-mW laser is concentrated on a $1.00 -\text{mm}^{2}$ area. (a) What is the intensity in $\text{W}/\text{m}^{2}$ ? (b) Suppose a 2.00-nC electric charge is in the beam. What is the maximum electric force it experiences? (c) If the electric charge moves at 400 m/s, what maximum magnetic force can it feel?