Two concentric circular wire loops in the same plane each carry a current. The larger loop as a current of 8.46 A circulating clockwise and has a radius of 6.20 cm. The smaller loop has a radius of 4.42 cm. What is the magnitude and direction of the current in the smaller loop if the total magnetic field at the center of the system is zero?
A. 6.03 A CCW
B. 6.03 A CW
C. 12.8 A CCW
D. 12.8 A CW
A. 6.03 A CCW
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If the orbital velocity of an eclipsing binary is 97 km/sec and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km b. 350,000 km c. 194 km d. 700,000 km e. 4656 km
Your instructor rides on a merry-go-round turning at a constant rate. In which direction does the net force on your instructor point?
a. down b. tangent to the circular path c. away from the center d. toward the center
A boy scout will be burned more severely by
A) 100 g of water at 100°C. B) 100 g of steam at 100°C. C) both about equally D) neither of these
The temperature coefficient of resistivity of iron is 5.0 × 10^-3 / °C; that of carbon is -0.50 × 10^-3 / °C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20°C, are cooled from that temperature to -80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. -0.10. b. +1.9. c. +2.1. d. -10. e. +10.