How much current must flow through a long straight wire for the magnetic field strength to be 1.0 mT at 1.0 cm from a wire? (?0 = 4? × 10-7 T ? m/
A)
A) 50 mA
B) 9.2 A
C) 16 A
D) 50 A
E) 5.0 mA
D
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Except Venus and Uranus, all the other planets:
A) rotate in the counterclockwise direction as seen from the north. B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north. C) revolve around the Sun in the clockwise direction as seen from the north. D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.
________ is (are) produced by atomic transitions in the presence of a strong magnetic field
a. Differential rotation b. Granules c. The Zeeman effect d. Spicules e. The coronal hole
Which of the following types of robotic mission to a planet is generally the cheapest? (Assume that the spacecraft destination is the same in all cases.)
A) flyby B) orbiter C) lander D) sample return mission
Eddy current in conductors
A. step up voltages. B. dissipate energy. C. increase currents in circuits. D. decrease net charges. E. increase net charges.