Solenoid: Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L), but all other quantities remained the same, the magnetic field inside the solenoid will
A. remain the same.
B. become twice as strong as initially.
C. become one-half as strong as initially.
D. become four times as strong as initially.
E. become one-fourth as strong as initially.
Answer: C
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The temperature of a sample of a substance is a way to gauge
A. the kinetic energy of the fastest moving molecule in the sample. B. the average momentum of the fastest 50% of the molecules in the sample. C. the average kinetic energy of the molecules in that sample. D. the average momentum of the molecules in a sample.
Suppose a current-carrying wire has a cross-sectional area that gradually becomes smaller along the wire so that the wire has the shape of a very long, truncated cone. How does the drift speed vary along the wire?
1.It slows down as the cross section becomes smaller. 2.It speeds up as the cross section becomes smaller. 3.It doesn't change. 4.More information is needed.
Why can't a worldline on a spacetime diagram be horizontal?
A) A horizontal worldline corresponds to something moving infinitely fast. B) A horizontal worldline represents traveling backward in time. C) A horizontal worldline represents moving at exactly the speed of light. D) A horizontal worldline is possible. It corresponds to a constant, finite speed. E) A horizontal worldline is possible. It corresponds to a stationary object.
The phenomenon easily explained only in terms of the particle model of light is
A) reflection. B) refraction. C) photoelectric effect. D) diffraction. E) none of the above