An aquarium contains a 5-cm layer of water (n = 1.33) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the air is 30°, what is the angle of refraction into the carbon tetrachloride?
a. 58°
b. 69°
c. 37°
d. 20°
e. 75°
D
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Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A) It is doubled. B) It stays the same. C) It is tripled. D) It is quadrupled. E) It is reduced by a factor of two.
A 0.50-m long solenoid consists of 1000 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.
A conducting rod slides at 3.0 m/s on metal rails separated by 2.0 m. The 0.66 m T magnetic field is into the paper. If the resistance is 220 m
what is the current in the circuit?
A. 18 mA
B. 9.0 mA
C. 87
A
D. 3.0
A
E. 4.5 mA
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
A. 8.0 m/s B. 16 m/s C. 24 m/s D. 30 m/s E. 4.0 m/s