A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m away? (?0 = 4? × 10-7 T ? m/

A)
A) 4.7 µT
B) 6.4 µT
C) 20 µT
D) 56 µT


C

Physics & Space Science

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If a nuclear fission reactor produces an average power of 1.0 GW over the course of a year, what mass of 235U is used up for a 365-day year if 200 MeV are released per fission reaction?

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Which space mission orbited Jupiter and dropped a probe into Jupiter's atmosphere?

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The carbon in a certain ancient ax-handle is only 1/8--one-eighth--as radioactive as the carbon in living wood. The half-life of 14C is 6000 years. From these facts we can conclude that

A) the ax-handle was made from an unusual type of wood that was less radioactive than normal wood. B) the ax-handle is about 18,000 years old. C) the natural carbon-radioactivity at the time the ax-handle was made was only one-eighth of what it is today. D) the ax-handle is about 12,000 years old. E) the ax-handle is about 48,000 years old.

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