A power transmission line 50 km long has a total resistance of 0.60 ?. A generator produces 100 V at 70 A
In order to reduce energy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. (a) What percentage of the original energy would be lost if the transformer were not used? (b) What percentage of the original energy is lost when the transformer is used?
(a) 42%
(b) 0.0042%
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A flat conductor of thickness 0.500 mm is placed in a magnetic field of 0.200 T perpendicular to the flat surface. If there are 
charge carriers (i.e., electrons) per m3, what is the Hall voltage generated when 3.40 A flows along the conductor?
A. 0.266 mV B. 0.531 mV C. 0.797 mV D. 1.06 mV E. 2.12 mV
Dispersing light that has traveled from a hot wire through a cool gas gives what type of spectrum?
a. Line absorption b. Continuous c. Line emission d. Ultraviolet
Is it good or bad that many materials must be imported to run the economy of any country?
What will be an ideal response?
The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
a. ultraviolet b. infrared c. x ray d. microwave e. gamma ray