A beam of electrons is sent in the positive x-direction in a region with a uniform magnetic field B in the positive y-direction and a uniform electric field E in the positive z-direction. At which of the following speeds would the electrons be deflected in the positive z-direction?
a. v < E/B
b. v = E/B
c. v > E/B
d. There is no speed for which this will happen.
d
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A metal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. A uniform magnetic field of 2.0 mT is directed at an angle of 30° with the plane of the rotation. What is the magnitude of the potential difference between the two ends of the blade?
a. 5.5 mV b. 6.4 mV c. 3.2 mV d. 11 mV e. 13 mV
Two parallel wires carry currents in the same direction. The direction of the force on one wire
A) is toward the other wire. B) is perpendicular to the plane of the wires. C) is away from the other wire. D) is along the wire. E) cannot be determined
The narrowness of the rings of Uranus and Neptune is believed to be caused by
a. gravitational interactions between ring particles. b. a spiral density wave which confines them. c. the magnetic field which holds them in place. d. the smaller mass of Uranus and Neptune as compared to that of Saturn. e. small shepherd moons that orbit near the rings.
Rocky debris larger than 100 meters in diameter seen to be orbiting the sun are called ________
Fill in the blank(s) with correct word