Consider the filter circuit shown in figure below. (a) Compute the ratio of the

Question

Consider the filter circuit shown in figure below. (a) Compute the ratio of the output voltage across the resistor to the input voltage with angular frequency omega (b) What value does this ratio approach as the frequency decreases toward zero? Show. (c) At what frequency is the ratio equal to 0.5 ? The energy of an electromagnetic wave resides in its (a) frequency(b) electric and magnetic fields (c) velocity (d) wavelength A changing magnetic field gives rise to (a) an electric field (b) sound waves (c) electromagnetic waves (d) nothing in particular At a certain time, the electric field of an EM wave is 3 times 10^-4 N/C. The magnetic field at that moment is (a) 10^-12 T (b) 3 times 10^-4 T (c) 3 T (d)10^4 T An EM wave has E_max = 0.5 V/m. The average energy density of the wave is in J/m^3 (a) 0.16 J/m^3 (b) 1.6 J/m^3 (c) 16 J/m^3 (d) 200 J/m^3 The voltage lags behind the current by 1/4 cycle in (a) a pure inductor (b) in a pure capacitor (c) a pure resistor (d) a circuit with capacitance and inductance The power factor of a circuit is equal to (a)R/Z (b)RZ (c) X_C/Z (d)X_I/Z At a certain time, the electric field of an EM wave is 5 N/C. Find the magnetic field The capacitive reactance of a 2.0-mH coil in a 7957.75-Hz circuit is approximately equal to According to Maxwell's hypothesis, a changing electric field gives rise to (a) an emf (b) an electric current (c) radiation pressure (d) a magnetic field Electromagnetic waves transport (a) energy (b) charge (c) frequency (d) wavelength

Explanation / Answer

11) correct option is (b)

12) correct option is (a)

13) E = 3*10^-4 N/C

E = Bc

3*10^-4 = B*3*10^8

B = 1*10^-12 T

correct option is (a)

14) Emax = 0.5 V/m

u = 0.5eoE^2

u = 0.5*8.85*10^-12*0.5^2

u = 1.1*10^-12 J/m3

15)Correct option is (d)

16) cos(phi) = R/Z

correctoption is (a)

17) E = 5 N/C

E = Bc

5 = B*3*10^8

B = 1.67*10^-8 T

18) f = 7957.75 Hz, L = 2mH

X = wL = 2*3.14*7957.75*0.002

X = 99.95 ohms

19) correct option is (d)

20) correct option is (a)

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