Chapter 34 Concept Tests CT34 1 Consider the following configuration of field lines This could be a A E field B B field C Either E or B This could represent the field lines of a A E field B B field C Either E or B CT34 2 d E between the dt plates is equal to the conduction current I in the wires leading to the capacitor Assume the wires are very long and straight and that the capacitor gap is so small that fringing effects are negligible For a charging capacitor the displacement current o At point A between the capacitor plates there is a A a changing E field and a constant B field B a changing E field and a changing B field C a changing B field and a constant E field D a changing E field and zero B field E some other answer I I A L As you move along line L the B field is A constant B not constant Q34 3 Under cover of night a Girl scout signals her friends on a distant hill by alternately placing slabs of red or green Jell O over here flashlight This signal is most accurately described as A Frequency modulation B Amplitude modulation CT34 4 The electric fields of two E M waves are described by b g E y E cos kx t The wave number k of wave 1 is larger than that of wave 2 k1 k2 Which wave has the larger frequency f A Wave 1 B Wave 2 C impossible to tell For either wave at x 0 and t 0 what is the direction of the B field A x E none of these B y C x D z CT34 5 A point souce of radiation emits power Po isotropically in all directions uniformly A detector of area ad is located a distance R away from the source What is the power p received by the detector A R detector ad Po ad 4 R 2 a 2d B Po 2 R Po C Po D E None of these ad R Po ad R 2 Q34 6 Two radio dishes are receiving signals from a radio station which is sending out radio waves in all directions with power P Dish 2 is twice as far away as Dish 1 but has twice the diameter Which dish receives more power A Dish 1 B Dish 2 C Both receive the same power Dish 1 Dish 2 CT34 7 A polarized beam of light passes through three ideal polaroid filters The filters in order 1st 2nd 3rd are tilted at 0o 45o and 90o with respect to the incoming beam s axis Does any light get through the all the filters and come out the other side E A Some light gets through c B No light gets through CT34 7 An unpolarized beam of light apsses through 2 polaroid filters oriented at 45o with respect to each other The intensity of the original beam is Io What is the intensity of the light coming through both filters Hints cos45o 1 2 The average of cos2 average over all values of is cos2 1 2 Io A 1 2 Io B 1 4 Io c C 1 8 Io D 1 16 Io E None
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