A long wire lies in a tangle on the surface of a table, as shown below. When a current is run through the wire as shown, the largest component of the magnetic field at X points
A. into the table.
B. out of the table.
C. parallel to the nearest segment of wire.
D. antiparallel to the nearest segment of wire.
E. along a circle which has its center at the center of the overall loop.
Answer: B
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LR Circuits: As shown in the figure, a circuit consists of a resistor R = 17 ? in series with an ideal inductor L = 49 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. At that instant, what is the rate of change of the current?
A. -4.2 A/s B. -12 A/s C. -19 A/s D. -27 A/s E. -35 A/s
Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because
A) it is too dangerous to send the Space Shuttle to service satellites during solar maximum. B) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits. C) of increased magnetic interference. D) they are more likely to have their electronics "fried" by a solar flare during solar maximum.
A heater draws 20A when connected to a 110-V line. If the electric power costs 20 cents per kilowatt hour, the cost of running the heater for 10 hours is
A) $0.44. B) $1.10. C) $4.40. D) $11.00. E) none of the above
Which of the following compounds would best serve as a starting point for its production?
Formaldehyde is a toxic preservative with the following chemical formula: H2C=O A) H3COH B) H2C=CH2 C) H2O D) CH3CH2OH E) none of the above