The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole.
b. the south geographic pole of the earth is the earth's magnetic south pole.
c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole.
d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole.
e. the north geographic pole of the earth is the earth's magnetic north pole.
a
You might also like to view...
In what sense are the quasars "quasi-stellar"?
A) Their energy production is hydrogen-helium fusion, like main sequence stars. B) They are upscale versions of O stars, yet hundreds of times more massive. C) Their luminosity comes from the millions of supergiants that compose them. D) Their spectra is like that of ordinary stars. E) In short time exposures, their images looked stellar.
A spaceship of triangular shape, having a length three times its width, is capable of relativistic speeds. How fast would it have to move so that to a stationary observer its length would equal its width?
a. 0.333c b. 0.816c c. 0.943c d. 0.650c e. This is not possible.
A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect
Power: A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?
A. 1.5 kJ B. 3.0 kJ C. 0.18 MJ D. 11 MJ