What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A
b. 89 A
c. 61 A
d. 75 A
e. 37 A
d
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A student wishes to build a telescope. She has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10x?
What will be an ideal response?
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the lifetime of
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Conductors: A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)
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Power: A series RLC circuit has a 100-? resistor, 2.0-mH inductor and a 4.0-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power factor of this circuit?
A. 0.54 B. 0.64 C. 0.74 D. 0.84 E. 0.94