Charge of uniform linear density (4.0 nC/m) is distributed along the entire x axis. Determine the magnitude of the electric field on the y axis at y = 2.5 m.
A. 36 N/C
B. 29 N/C
C. 43 N/C
D. 50 N/C
E. 58 N/C
Answer: B
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The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.60 × 10^7 m/s in a distance of 4.00 cm. What electric field is required? (me = 9.11 × 10^-31 kg and e = 1.60 × 10^-19 C)
a. 18,200 N/C c. 36,400 N/C b. 9110 N/C d. 72,800 N/C
A cup that is 6.0 cm tall is in front of a concave lens. The image of the cup is 2.5 cm tall and 7.5 cm from the lens. What is the focal length of the lens?
A) -6.0 cm B) -7.5 cm C) -13 cm D) +18 cm E) +6.0 cm
In a solar cell the light initially passes through the n-type silicon to reach the pn-junction where it is desired that the light absorption occur. If we want at least 90 percent of the light entering a silicon solar cell to reach the pn-junction region, what is the maximum thickness of the n-type material for 0.6 ?m light assuming pure silicon?
What will be an ideal response?
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A. a whole number of wavelengths. B. an odd number of half-wavelengths. C. a whole number of half-wavelengths.