A straight wire 20 cm long, carrying a current of 4 A, is in a uniform magnetic field of 0.6 T. What is the force on the wire when it is at an angle of 30° with respect to the field?
A) 0.2 N
B) 0.3 N
C) 0.4 N
D) 0.5 N
E) 0.6 N
A
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Fill in the blank(s) with correct word
On an H-R diagram, stellar radii ________
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A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0
A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires? A) 4I B) 2I C) I D) I/2 E) I/4
Energy and Mass: How much mass is lost during a reaction in which 1.7 × 108 MeV of energy is released? (c = 3.0 × 108 m/s, 1 eV = 1.6 × 10-19 J)
A. 1.8 × 10-8 kg B. 5.7 × 10-9 kg C. 1.9 × 10-17 kg D. 3.0 × 10-22 kg