The field just outside the surface of a long conducting cylinder which has a 2.0-cm radius points radially outward and has a magnitude of 200 N/C. What is the charge density on the surface of the cylinder?
a. 2.7 nC/m2
b. 1.8 nC/m2
c. 3.5 nC/m2
d. 4.4 nC/m2
e. 0.90 nC/m2
b
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An engineer wants to use a river (minimum temperature of 
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A. 233 kW B. 187 kW C. 332 kW D. 418 kW
Lenz's Law: As shown in the figure, a straight wire carries a current I into the page. The wire passes through the center of a toroidal coil. If the current I is quickly reduced to zero, the direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
Why can't we see past the cosmological horizon?
A) The universe extends only to this horizon. B) Beyond the cosmological horizon, we are looking back to a time before the universe had formed. C) We do not have telescopes big enough. D) We do not have sensitive enough detectors. E) The cosmological horizon is infinitely far away, and we can't see to infinity.
What is a positron?
a. Another name for a proton. b. Another name for an alpha particle. c. A charged neutrino. d. A negatively charged proton. e. The antiparticle of an electron.