Which two processes can generate energy to help a star maintain its internal thermal pressure?
A) nuclear fission and supernova B) nuclear fusion and gravitational contraction
C) nuclear fusion and supernova D) nuclear fusion and nuclear fission
B
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A long straight wire (diameter = 2.0 mm) carries a current of 25 A. What is the magnitude of the magnetic field 0.50 mm from the axis of the wire?
A. 5.0 mT B. 10 mT C. 0.63 mT D. 2.5 mT E. 0.01 mT
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Indicate whether the statement is true or false
What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A?
A) 7.3 × 10-5 J/ m3 B) 3.7 × 10-5 J/ m3 C) 3.6 × 10-4 J/ m3 D) 1.2 × 10-4 J/ m3 E) cannot be determined with the information given