965_Physics ProblemsTechnical Physics

965_Physics ProblemsTechnical Physics - 306 Electromagnetic...

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306 Electromagnetic Waves Additional Problems P34.47 (a) P = SA : L N M O Q P 1 340 4 1 496 10 3 77 10 11 2 26 Wm m W 2 ej e j π .. (b) S cB = max 2 0 2 µ so B S c max . . == × × = 2 24 10 1340 300 10 335 0 7 8 NA ms T 22 e j S E c = max 2 0 2 so Ec S max × × = 2 2 4 10 3 00 10 1 340 1 01 0 78 µπ e j bg kV m P34.48 Suppose you cover a 1.7 m-by-0.3 m section of beach blanket. Suppose the elevation angle of the Sun is 60°. Then the target area you fill in the Sun’s field of view is 17 03 30 04 c o s. m m m 2 af °= . Now I A U At UI A t 06 05 04 3600 6 m s J ... ~ . P34.49 (a) εθ =− d dt d dt BA B Φ cos a f εω θ ω = A d dt Bt A B t max max cos cos sin cos b g επ tf B A f t = max sin cos tr f B f t = max cos sin Thus, max max cos = 2 rfB where is the angle between the magnetic field and the normal to the loop. (b) If E is vertical, B is horizontal, so the plane of the loop should be vertical and the plane should contain the line of sight of the transmitter . P34.50 (a) F GM m R GM R r SS grav
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