At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/
A)
A) 1.0 mm
B) 1.0 cm
C) 2.0 cm
D) 3.0 cm
E) 4.0 cm
C
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A 2.00-m long piano string of mass 10.0 g is under a tension of 320 N. Find the speed with which a wave travels on this string
a. 506 m/s b. 253 m/s c. 126 m/s d. 358 m/s e. 80.0 m/s
You wish to read from a single lightbulb in a lamp at your desk. In order to get the same brightness on the page from a 25 W bulb as you can from 100 W bulb, how much closer do you need to bring the lamp to your book? Assume that the light bulbs are equally efficient.
A. 1/2 the distance B. 1/8 the distance C. 1/4 the distance D. 1/16 the distance
A 5.0 ?F and a 7.0 ?F capacitor are connected in series across an 8.0-V DC source. What is the voltage across the 5.0 ?F capacitor?
A) 0 V B) 8.0 V C) 2.7 V D) 3.6 V E) 4.7 V
The loss of usable energy in cables used to conduct electricity from power plants to cities is cause by ________________
Fill in the blank(s) with correct word