A circular loop of wire is rotated at constant angular speed about an axis whose direction can be varied
In a region where a uniform magnetic field points straight down, what must be the orientation of the loop's axis of rotation if the induced emf is to be a maximum? A) It must be vertical.
B) Any horizontal orientation will do.
C) It must make an angle of 45° to the vertical.
D) It must make an angle of 45° to the direction North.
E) It must make an angle of 90° to the direction North.
B
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A negatively charged rubber rod is brought near the knob of a positively charged electroscope. The result is that:
A) electroscope leaves will move farther apart B) the rod will lose its charge C) electroscope leaves will tend to collapse D) electroscope will become discharged E) nothing noticeable will happen
The Sun will exhaust its nuclear fuel in about
A) 5000 AD. B) 5 million years. C) 5 billion years. D) 50 billion years.
A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m
An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is what is the frequency of the second harmonic of this pipe?
A) 638 Hz B) 425 Hz C) 213 Hz D) 850 Hz