The critical angle in air for a particular type of glass is 39.0°. What is the speed of light in this class glass? (c = 3.00 × 108 m/s)
A) 1.97 × 108 m/s
B) 1.94 × 108 m/s
C) 1.91 × 108 m/s
D) 1.89 × 108 m/s
E) 2.00 × 108 m/s
D
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Indicate whether the statement is true or false
If the magnetic field points in the +z direction but is decreasing in magnitude, which way will current flow?
A. Counterclockwise B. Clockwise C. No current will flow.
A 4.50-kg wheel that is 34.5 cm in diameter rotates through an angle of 13.8 rad as it slows down uniformly from 22.0 rad/s to 13.5 rad/s. What is the magnitude of the angular acceleration of the wheel?
A) 0.616 rad/s2 B) 5.45 rad/s2 C) 111 rad/s2 D) 22.5 rad/s2 E) 10.9 rad/s2
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