1. The problem statement, all variables and given/known data A circular uniform laser beam has a power of P = 3.2 mW and a diameter of d = 8.5 mm. The beam is a form of electromagnetic raditation with both electric and magnetic field components. (a) Calculate the intensity of the beam in units of W/m^2 (b) Calculate the energy (delta U) delivered in a time of t = .065 s in Joules. (c) Use the intensity of the beam (I) to calculate the amplitude of the electric field in V/m (d) The amplitudes of the electric and magnetic fields have a fixed relationship. Based on that relationship use the result of part (c) to calculate the amplitude of the magnetic field (B) in Tesla. I know that the power is P = 3.2 mW, and the diameter is d = 8.5 mm. From this I calculated intensity of the beam, so part (a) is complete. I can multiply that by time to get energy, so part (b) is complete as well. Where I'm running into a problem is somehow finding the electric field without knowing anything but the intensity and the energy in a small window of time. Typical calculations for electric potential energy haven't worked at all. 2. Relevant equations delta U = Pt I = P/A A = pi*r^2 That's about all I know. Our professor left us totally on our own to learn this material. 3. The attempt at a solution All I've managed is to calculate the delivered energy in a small window of time and the intensity of the beam.