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 C) Same frequency D) Depends on how the light is madeCTEM-3. An EM plane wave is described by 00ˆˆE E sin(kz t)x, B B sin(kz t)yωω= − = −KK E (x) 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 c (z)B (y)123CTEM-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? A: PRaod42π RB: PaRod22 detectorad Po C: PaRod D: PRaodπ2 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 1Dish 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
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