The circuit below contains three 100-W light bulbs and a capacitor. The emf is 110 V and the capacitor is fully charged. Which light bulb(s) is(are) brightest?
A. A
B. B
C. C
D. A and B
E. A and C
Answer: B
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Indicate whether the statement is true or false
Magnetic Field of a Long Wire: Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 20 cm. At what point between the two wires do they produce the same strength magnetic field?
A. 4.0 cm from the 20 A wire B. 8.0 cm from the 20 A wire C. 12 cm from the 20 A wire D. 16 cm from the 20 A wire E. 18 cm from the 20 A wire
The human eye is sensitive to light with wavelength down to 710 nm. What is the frequency of radiation at this wavelength? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 4.23E+5 Hz b. 4.42E+6 Hz c. 4.23E+14 Hz d. 4.37E+7 Hz e. 2.18E+7 Hz
One ray that is useful in locating the image formed by a convex mirror is the ray that is incident on the mirror in a path directed toward the focal point. This ray is reflected
A. through the center of curvature. B. directly back along its incident path. C. on a path tangent to the mirror. D. on a path parallel to the mirror axis.