Unpolarized light is incident upon two polarization filters that do not have their transmission axes aligned. If of the light passes through this combination of filters, what is the angle between the transmission axes of the filters?
A) 53°
B) 73°
C) 85°
D) 80°
Answer: A
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Transformers: You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor. How many windings should the secondary circuit contain?
Fill in the blank(s) with the appropriate word(s).
By how many decibels does the intensity level of a sound increase when you triple the intensity of a source of sound?
A) 12 dB B) 3.0 dB C) 4.8 dB D) 6.0 dB E) 9.5 dB
Two wires, each having a weight per unit length of 1.0 × 10^?4 N/m, are strung parallel, one 0.10 m above the other. If the wires carry the same current, though in opposite directions, how great must the current in each wire be for the magnetic field of the lower conductor to balance the weight of the upper conductor?
The graphs below show a voltage phasor at different instances of time. Which voltage phasor shows the instantaneous value of the voltage with the largest magnitude?
a.
b.
c.
d.
