The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/
A)
A) 2.0 cm
B) 2.5 cm
C) 4.0 cm
D) 5.0 cm
E) 10 cm
D
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The fuel most likely to power tomorrow's scooters, forklifts, and busses is
A) hydrogen. B) helium. C) lithium.
Consider two parallel wires carrying current in opposite directions. Which one of the following statements to true concerning this situation?
a) The two wires will attract each other, even if no external magnetic field is applied to the wires. b) The two wires will repel each other, even if no external magnetic field is applied to the wires. c) The two wires will attract each other, only if an external magnetic field is applied to the wires. d) The two wires will repel each other, only if an external magnetic field is applied to the wires. e) The wires will be neither attracted nor repelled from each other when no external magnetic field is applied to the wires.
That quasars were at cosmological distances yet appeared like ordinary faint stars meant:
A) they were the brightest stars ever observed. B) they must be very large. C) they must contain many O and B type stars. D) they must be producing such large quantities of energy than even fusion could not explain their output. E) they must be very small, but bright due to gravitational lensing.
Recent measurements of the temperature fluctuations in the cosmic microwave background radiation support the prediction of inflation that the overall geometry of the universe is flat
Indicate whether the statement is true or false