26. The magnitude of the magnetic field at point P for a certain electromagnetic

Question

26. The magnitude of the magnetic field at point P for a certain electromagnetic wave is 2.12 HT What is the magnitude of the electric field for that wave at m (c-3.0 × 108 m/s) A) 636 N/C B) 745 N/C C) 5.23 HN/C D) 6.36 uN/C E) 7.45 ?N/C 27. If the intensity of an electromagnetic wave is 80 Mw/m2, what is the rms value of the electric field of this wave? (c-3.0 x 108 m/s, ?0-4? x 10-7 T-m/A, E0 8.85 x 10-12 C2/N m2) A) 1.7 x 105 N/C B) 0.33 N/C C) 1000 N/C D) 14 N/C E) 4.3 x 101 NIC 28. Polarization of an electromagnetic wave is based on the orientation of the A. magnetic field B. direction of travel C. electric field D. magnetic flux 29. Light of intensity 10 1 Watt /m2 and polarized horizontally passes through three polarizes. The first and third polarizing axes are horizontal, but the second one is oriented 20.0° to the horizontal. What is the intensity of the light that passes through the set of polarizers? A) 0.780 Watt /m2 B) 0.180 Watt /m2 C) 0.442 Watt /m2 D) 0.883 Watt /m2

Explanation / Answer

26. E = c B

E = (3 x 10^8 m/s) (2.12 x 10^-6 T)

E = 636 N/C

Ans(A)

27. I = Erms^2 / u0 c

80 x 10^6 W/m^2 = (Erms)^2 / (4pi x 10^-7 x 3 x 10^8)

E_rms = 1.7 x 10^5 N/C

Ans(A)

28. (C) electric field

29. If = Ii (cos(theta))^2

so I1 = (1) (cos0)^2

I2 = (I1 ) (cos20)^2

I3 = (I1)(cos20)^2

I = (1) (cos20)^4 = 0.780 W/m^2

Ans(A)

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.