A copper wire of length 10 cm is in a magnetic field of 0.30 T. If it has a mass of 20 g, what minimum current through the wire would cause a magnetic force equal to its weight?
a. 4.9 A
c. 2.0 A
b. 6.5 A
d. 1.3 A
B
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Why do compasses point north?
a. Because the Coriolis force tends to force to point to the North Pole. b. Because Earth is a magnet with a magnetic north pole near the geographic North Pole. c. Because Earth is a magnet with a magnetic south pole near the geographic North Pole. d. Because the Earth is unmagnetized but its atmosphere is magnetic, especially near the North Pole. e. Because the Coriolis force deflects magnetic field lines to the right.
What is the only force that can overcome the repulsion between two positively charged nuclei to bind them into an atomic nucleus?
A) the gravitational force B) the electromagnetic force C) the strong force D) the Coriolis force E) the weak force
Telephones don't transmit frequencies above 3,400 Hz. Musical notes should sound normal over the telephone as long as they are below 3,400 Hz
a. True b. False Indicate whether the statement is true or false
Which of the following is not associated with van der Waals bonds?
(a) Fluctuating- electric dipoles (b) Electron transfer (c) Permanent- electric dipoles (d) Relatively low melting temperature