A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. If the magnet is dropped from this position what is the direction of the induced current in the coil?
A) There is no current in the coil.
B) counterclockwise
C) clockwise
D) Not enough information is provided.
B
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On September 22 or 23, the noonday Sun is overhead at what latitude?
a. 0° b. 23.5°N c. 23.5°S d. That of the Tropic of Cancer
Three negative charges of equal magnitudes are positioned along the x-axis at x = -a, x=0, and x = +a respectively. The charge located at x=0 is moved away along the y-axis to a position (x,y) = (0, +a)
How does the potential energy of the system of charges change as a result? A) The potential energy may increase or decrease depending on the magnitude of the charges. B) The potential energy increases. C) The potential energy decreases. D) The potential energy stays the same. E) More information is needed to answer the question.
The resistance of a filament that carries 2 A when a 10-V potential difference across it is
A) 2 ohms. B) 5 ohms. C) 10 ohms. D) 20 ohms. E) more than 20 ohms.
Before the switch is closed in the figure, the potential across the capacitor is 200 V. At some instant after the switch is closed, the instantaneous current is 0.70 A. What is the energy in the capacitor at this instant?
a.
49 mJ
b.
31 mJ
c.
80 mJ
d.
0.13 J
e.
62 mJ