In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
a. the potential of the nearest battery is the potential at the junction.
b. there are no transformations of energy from one type to another in a circuit loop.
c. capacitors tend to maintain current through them at a constant value.
d. current is used up after it leaves a junction.
e. charge is neither created nor destroyed at a junction.
e
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Which of the following best describes the current status of our understanding of the solar neutrino problem?
A) Experimental evidence indicates that the problem is solved and the expected number of solar neutrinos are indeed being produced by the Sun. B) The problem arose only because experimental data were being misinterpreted; on re-examination, the old data showed that the expected number of neutrinos were being detected. C) We have learned that the Sun's interior undergoes fusion at a lower rate than we had expected, and that is why we had observed fewer neutrinos than expected. D) The solar neutrino problem remains as perplexing as ever, and indeed makes everything we think we know about stars suspect.
A 4.0-pC point charge is placed at the center of a hollow (inner radius = 2.0 cm, outer radius = 4.0 cm) conducting sphere which has a net charge of 4.0 pC. Determine the magnitude of the electric field at a point which is 6.0 cm from the point charge.
A. 35 N/C B. 25 N/C C. 30 N/C D. 20 N/C E. 10 N/C
The two most common types of poor eyesight are the result of improper ______________
Fill in the blank(s) with correct word
Make a drawing illustrating the positions of the Sun, the Moon, and Earth during a total solar eclipse. Show the shadows of both the Moon and Earth. (It is not necessary to make the drawing to scale.)