Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT
b. 10 mT
c. 8.0 mT
d. 1.6 mT
e. 7.2 mT
B
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A 20-cm length of wire is held along an east-west direction and moved horizontally to the north with a speed of 3.0 m/s in a region where the magnetic field of the earth is 60 ?T directed 30° below the horizontal. What is the magnitude of the potential difference between the ends of the wire?
A. 36 ?V B. 18 ?V C. 31 ?V D. 24 ?V E. 21 ?V
A car increases its forward velocity uniformly from 40 m/s to 80 m/s while traveling a distance of 200 m. What is its acceleration during this time?
A) 24 m/s2 B) 8.0 m/s2 C) 9.6 m/s2 D) 12 m/s2
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV
What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz
The acceleration (or deceleration) of the expansion of the universe is determined by
a. the standard matter, baryons and leptons. b. the dark matter in the universe. c. the dark energy in the universe. d. all of the above. e. only (b) and (c) above.