A current in a long, straight wire produces a magnetic field. The magnetic field lines:
a. go out from the wire to infinity.
b. form circles that go around the wire.
c. come in from infinity to the wire.
d. form circles that pass through the wire.
B
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According to current theory, which of the following elementary particles does not contain quarks?
A. Protons B. Electrons C. Mesons D. Neutrons
Seamounts with flat tops are known as ______________
Fill in the blank(s) with correct word
At a certain instant, a proton is moving in the positive x direction through a magnetic field in the negative z direction. What is the direction of the magnetic force exerted on the proton?
1.positive z direction 2.negative z direction 3.positive y direction 4.negative y direction 5.The force is zero.
The lithosphere consists of
a. all of the crust's depth. b. all of the crust's depth and part of the mantle's depth. c. part of the crust's depth. d. all of the crust's depth and all of the mantle's depth.