1. (a) (2 points) For a transmission line circuit, what is the smallest distance d from the load for which the input imp

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1 A 2 Points For A Transmission Line Circuit What Is The Smallest Distance D From The Load For Which The Input Imp 1 (109.06 KiB) Viewed 41 times

1. (a) (2 points) For a transmission line circuit, what is the smallest distance d from the load for which the input impedance is the same as the load impedance Zin = ZL? (i) dmin = 1/8 (ii) dmin = X/4 (iii) dmin = 1/2 (iv) dmin = 1 a (b) (2 points) For a transmission line circuit, what is the smallest distance d from the load for which the input voltage is the same as the voltage at the load Vin =V_? (i) dmin = 1/8 (ii) dmin = X/4 (iii) dmin = 1/2 (iv) dmin = 1 (c) (2 points) Consider the following statements about voltage standing wave ratio (VSWR): i. The VSWR for a lossless transmission line is equal to the normalized impedance value on the constant I circle crossing the real axis on the right side on a Smith Chart. ii. On a lossless transmission line with characteristic impedance Zo, terminated with a purely short circuit load, VSWR = 1. (i) Both are false. (ii) Only (i) is true. (iii) Only (ii) is true. (iv) Both are true. (d) (3 points) An infinite static current sheet with J. = 2x [A/m] is located at y=1 [m], and another sheet with J, = 22 [A/m] is located at x = 1 m. What is the magnetic field at the origin? (i) V22 (ii) -22 (iii) -2ỹ - 22 (iv) û + Ź (v) -ý -Ź

(e) (3 points) The figures below represent positively charged particles moving in the same uniform magnetic field. The field is directed from left to right. All of the particles have the same charge and same speed v. Rank these situations according to the magnitudes of the force exerted by the field on the moving charge, from greatest to least. 1 V A.I=II=III B. III>I>II C.II>I>III D.I>II>III E. III>II=I Magnetic -------> + Field -------> II III -------> -------> ----> -------> ---- -------> ------> ---- + Magnetic Field Magnetic Field -------> ------> -------> ------ ----- -------> ----- ---- (f) (2 points) To match a load of ZL 30 (2], to a transmission line with characteristic impedance Zn = 75 [12], we can insert a quarter wave transformer at a distance d from the load that is (circle ALL that apply): (i) d=0 (ii) d > 0 (iii) More information is needed = (g) (2 points) Consider the circuit in the figure below. What is V(2) when 2 = 1 at t = 1.5 [us]? t=0, close 40 Ω 100V wwww Zo=60Ω T=1 usec 120 Ω z=0 z=1 (i) 40V (ii) 80V (iii) 60V (iv) 20V (v) -20V

(h) (2 points) What is the magnetic field B at the center of a square loop, which carries a steady current I. The side of the loop is 2R. ס P. 1 (i) B = 20 (ii) B *R ol 2xR AR (iii) B = 401 (iv) B = V2201 SR (v) B=0 (i) (2 points) Consider the setup in the figure below in which I = 2 A. The power crossing this transverse cross section is: d=0.01m Ex Hy &r=2.25 x=0 y=0 w=0.2m (i) 0 (ii) 87 (iii) 121 (iv) 167 (v) 241

() (3 points) Two parallel wires 1 and 2 that are near each other carry currents 1 and 31 both in the same direction. Compare the forces that the two wires exert on each other. 31 (i) Wire 1 exerts a stronger force on wire 2 exert on 1. (ii) Wire 2 exerts a stronger force on wire 1 exert on 2. (iii) The wires exert equal magnitude attractive force on each other. (iv) The wires exert equal magnitude repulsive force on each other. (v) The wires exert no forces on each other.