9. (22 pts.) Electromagnetic waves from the Sun reach Earth with an intensity of

Question

9. (22 pts.) Electromagnetic waves from the Sun reach Earth with an intensity of about 1340 W/m2. a) Find the electric field of the electromagnetic waves. b) Find the magnetic field of the electromagnetic waves. 10. (22 pts.) A conducting rod of length 0.226 m moves with a speed of 4.63 m/s along frictionless U-shaped metal rail. The U-shaped metal rail is connected to a 15.8 ligh bulb. A 0.732 T magnetic field is perpendicular to the rod and points straight out of th page. a) Find the induced emf or voltage in the rod. b) Find the power used by the lightbulb.

Explanation / Answer

9.

Intensity

I=(1/2)ceoE2

1340=(1/2)*(3*108)(8.8542*10-12)*E2

E=1004.46 V/m

b)

magnetic field

B=E/c =1004.46/(3*108)

B=3.348*10-6T

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