The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed into the page, the direction of the magnetic field at P is closest to the direction of
A. A
B. B.
C. C.
D. D.
E. E.
Answer: E
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You push very hard on a heavy desk, trying to move it. You do work on the desk:
(a) whether or not it moves, as long as you are exerting a force. (b) only if it starts moving. (c) only if it doesn't move. (d) never—it does work on you. (e) None of the above.
When a car goes around a curve at twice the speed, the centripetal force on the car doubles
a. True b. False Indicate whether the statement is true or false
Astronomers now speculate that a galaxy's shape depends on all of the following except
a. the rate of star formation. b. the history of past collisions. c. the mass. d. All of the other choices may be important in determining a galaxy's shape.
In general, as you examine stars on the main sequence, going from bottom right to top left, their stellar radii ________
Fill in the blank(s) with correct word