An object that has zero resistance is a semiconductor
Indicate whether the statement is true or false
F
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A bolt of lightning strikes the ground 200 m from a 100-turn coil oriented vertically and with the plane of the coil pointing toward the lightning strike. The radius of the coil is 0.800 m and the current in the lightning bolt falls from 6.02 × 106 A to zero in 10.5 ?s. What is the voltage induced in the coil over this time period? [A question for future electrical engineers: is there any way
to get lightning to strike repeatedly at the same point?]
?
About how many stars does a globular cluster have?
A. About a dozen B. Hundreds C. Tens to hundreds of thousands D. Hundreds of millions E. Billions
Four coins, each with a Head and a Tail, are tossed randomly on to a table. The microstate is defined as the "number of Heads showing". The number of Heads can be, 0, 1, 2, 3, 4. What value for the "number of Heads showing" has the greatest number of microstates?
A. 0 B. 1 C. 2 D. 3 E. 4
What is a T Tauri star?
A. any variable star B. a young star that exhibits variable light and outflowing gas C. any star found in the constellation of Taurus D. a red giant with a peculiar spectrum