Two identical small conducting spheres are separated by 0.60 m. The spheres carry different amounts of charge and each sphere experiences an attractive electric force of 10.8N. The total charge on the two spheres is -24 ?C
The two spheres are now connected by a slender conducting wire, which is then removed. The electric force on each sphere is closest to A) zero.
B) 3.6 N, attractive.
C) 5.4 N, attractive.
D) 3.6 N, repulsive.
E) 5.4 N, repulsive.
D
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A15-? resistor is connected in parallel with a 30-? resistor. If this combination is now connected in series with an ideal 9.0-V battery and a 20-? resistor, what is the current through the 15-? resistor?
A) 0.10 A B) 0.13 A C) 0.20 A D) 0.26 A
Why is the Moon's average surface temperature so much lower than Earth's?
A. The Moon has no atmosphere to help retain heat at its surface. B. The Moon's rotation rate is much slower than Earth's. C. The Moon is much smaller than Earth and cooled more quickly. D. The Moon reflects more of the Sun's energy than Earth. E. The Moon has no magnetic field to prevent infrared radiation from escaping.
Two thin 80.0-cm rods are oriented at right angles to each other. Each rod has one end at the origin of the coordinates, and one of them extends along the +x-axis while the other extends along the +y-axis
The rod along the +x-axis carries a charge of -15.0 µC distributed uniformly along its length, and the other rod carries +15.0 µC uniformly over its length. Find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e = 1.60 × 10-19 C, ?0 = 8.85 × 10-12 C2/N • m2)
The energy output of a typical nuclear reactor is via
A) heating water to form steam. B) directing steam to a turbine. C) spinning a turbine to generate electricity. D) all of the above E) none of the above