A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because of __________
Fill in the blank(s) with correct word
electromagnetic induction
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What causes the pulses of a pulsar?
A) vibrations on the pulsar's surface B) As the pulsar rotates, beams of radiation along its magnetic axis sweep through space. C) The pulsar undergoes periodic explosions of nuclear fusion that generate strong emission. D) The pulsar is periodically eclipsed by an orbiting companion. E) The pulses are peaks and valleys of gravitational waves.
How many quark colors are there?
a. 1 b. 3 c. 6 d. none of the above
A planet is detected via the Doppler method. What does the time between peaks of the stellar velocity tell us?
A) the planet's size B) the planet's mass C) the planet's density D) the orbital period of the planet E) the orbital eccentricity of the planet
Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions
The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires A) points upward. B) points downward. C) points toward you. D) points away from you. E) is zero.