Question

Exercise 1 at Find the electric and magnetic field amplitudes in an EM that has an average energy density of 1.0 J/m². b) By what factor must the field amplitudes be increased if the average energy density is to be doubled to 2.0 J/m².

Answer 1

Summary:-

This question can be solved using a simple relationship bw energy density and electric and magnetic field's magnitudes.

(a) Now Solution Here, the average energy / of Em is given, n = 15 lm electric field is given by Eo where = 8.854 x 10-12 flm 18.854 X10-12 E: 17:13 Xo'E=3.36 X105 NICI Now, magnetic field is given by - B? where Mo = 4 TL x 10 t /m B- dalo 11x4 t 10 B = 1.98×10 3 T cho in this case, 'n' 2 J l m 3 a TE = 4.75 x 105 Nich magnetic field, B: In Mo B2 2.80 x 103 T