An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the inten

Question

An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 times 108 m/s, mu 0 = 4 pi times 10-7 T middot m/A, = 8/85 times 10-12 C2/N middot m2) Select one: a. 48 kW/m2 b. 6 kW/m2 c. 72 kW/m2 d. 12 kW/m2 e. 24 kW/m2 Which one of the following is a correct representation of electromagnetic waves from longer wavelength to shorter wavelength? Select one: a. radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays b. radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays c. radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays d. radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays e. radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays In a transformer, how many turns are necessary in a 110-V primary if the 24-V secondary has 100 turns? Select one: a. 550 b. 400 c. 240 d. 356 e. 458 A 96-mH solenoid inductor is wound on a 0.80 m in length and 0.10 m in diameter. A coil is tightly wound around the solenoid at its center. The coil's resistance is 9.9 ohms. The mutual inductance of the coil and solenoid is 31 mu H. At a given instant, the current in the solenoid is 540 mA, and is decreasing at the rate of 2.5 A/s. At the given instant, what is the magnitude of the induced current in the coil? (mu 0 = 4 times 10-7 T middot m/A). Select one: a. 11.8 mu A b. 9.8 mu A c. 5.8 mu A d. 7.8 mu A e. 3.8 mu A A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 mu C. At time t = 2.00 the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant? Select one: a. 5.71 mA b. 4.71 mA c. 2.71 mA d. 3.71 mA e. 1.71 mA

Explanation / Answer

32.

Intensity of the wave is given by

I=(1/2)(E2/uoc)

I=(1/2)(30002/(4pi*10-7)(3*108))

I=11.94 KW/m2=12 KW/m2

34.

from transformer turns ratio

Ns/Np=Vs/Vp

Np=Ns*(Vp/Vs)=100*(110/24)

Np=458 turns

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