Identical 8.0-?C point charges are positioned on the x axis at x = ±1.0 m and released from rest simultaneously. What is the kinetic energy of either of the charges after it has moved 2.0 m?
A. 84 mJ
B. 54 mJ
C. 96 mJ
D. 63 mJ
E. 48 mJ
Answer: C
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A battery has an internal resistance of 4.0 W. Which of the following load resistors would have the most power delivered to it when connected across the battery?
a. 1.4 W b. 2.0 W c. 4.0 W d. 8.0 W e. 16 W
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A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it
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