A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT.
b. 0.36 mT.
c. 23 mT.
d. 36 mT.
e. 45 mT.
e
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Circular Motion of Charges: In the figure, a small particle of charge -1.9 × 10-6 C and mass m = 3.1 × 10-12 kg has speed v0 = 8.1 × 103 m/s as it enters a region of uniform magnetic field. The particle is initially traveling perpendicular to the magnetic field and is observed to travel in the semicircular path shown with radius R = 5.0 cm. Find the magnitude and direction of the magnetic field in the region. 
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Does red light have higher or lower frequency than blue light? Does red light have longer or shorter wavelengths than blue light?
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Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the brightness
of the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
Some power plants extract energy from the warm ocean currents. A major disadvantage to these power plants is that
A. the amount of heat released to the environment is unacceptable. B. the cost of warm ocean water is quite high. C. the efficiency is quite low. D. there is no low temperature reservoir.