CTEM 1 A row of positive charges is stationary on the ground A person with a gauss meter which measures the magnetic field is running to the right along the row of charges at the same height as the charges and in front of them in the diagram below Does the person measure a non zero B field A Yes B No v What is the direction of the B field which the observer measures A Up B Down C Forward direction D backward direction E no direction B field zero CTEM 2 Which has higher frequency A Red light B Violet blue light D Depends on how the light is made C Same frequency CTEM 3 An EM plane wave is described by K K E E 0 sin k z t x B B0 sin k z t y E x 3 2 1 c z B y Consider 3 antennas labeled 1 2 and 3 Antenna 1 is on the z axis Antenna 2 is in the xz plane above 1 Antenna 3 is is off the z axis at the location shown Rank the antennas by average signal strength received from largest to smallest A 1 2 3 B 1 2 3 C 1 2 3 CTEM 4 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 Po a A 4 R 2 d R Po detector ad B C a 2d Po 2 R ad Po R Po D R 2 a d E None of these CTEM 5 Two radio dishes shaped like bowls 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 CTEM 6 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 her flashlight This signal is most accurately described as A Frequency modulation B Amplitude modulation
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