A 1.0 ?F capacitor has a potential difference of 6.0 V applied across its plates. If the potential difference across its plates is increased to 8.0 V, how much ADDITIONAL energy does the capacitor store?
A) 14 ?J
B) 28 ?J
C) 2.0 ?J
D) 4.0 ?J
A
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A long wire is known to have a radius greater than 4.0 mm and to carry a current uniformly distributed over its cross section. If the magnitude of the magnetic field is 0.285 mT at a point 4.0 mm from the axis of the wire and 0.200 mT at a point 10 mm from the axis, what is the radius of the wire?
a. 4.6 mm b. 7.1 mm c. 5.3 mm d. 12 mm e. 10 mm
A current carrying circular loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense
What is the direction of the magnetic field caused by this current, inside the loop? The magnetic field A) circles the loop in a clockwise direction. B) circles the loop in a counterclockwise direction. C) points straight up. D) points straight down. E) points toward the east.
The theory of seafloor spreading is supported by
A) geological, biological, and climatological data. B) paleomagnetic analysis of the ocean's floor. C) the change in Earth's polarity. D) none of these
One ampere is equivalent to
A. 1 C/s. B. 1 ohm/volt. C. 1 V/m. D. 1 N/C. E. 1 J/s.