Which of the following represents the equipotential lines of a dipole?
A.
B.
C.
D.
E.
Answer: E
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The index of refraction for a certain material is 1.399 for red light and 1.432 for blue light. Find the angle separating the two refracted colors if the:
(a) angle of incidence is 30°. (b) angle of incidence is 60°.
Starburst galaxies produce most of their light in the wavelength range of
A) X-rays. B) the ultraviolet. C) the visible. D) the infrared. E) all wavelengths.
Three resistors, each of different value, are used in a circuit with a power source supplying 12 volts. For which of the following resistor combinations is the total power supplied the greatest?
a. This cannot be found until it is known which resistor is in series with the parallel pair. b. all three resistors in series c. two of the resistors in parallel with the third resistor in series with the parallel pair d. all three resistors in parallel
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT