Each of two long straight parallel wires separated by a distance of 16 cm carries a current of 20 A in the same direction. What is the magnitude of the resulting magnetic field at a point that is 10 cm from each wire?
a. 57 ?T
b. 80 ?T
c. 64 ?T
d. 48 ?T
e. 40 ?T
d
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A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
A. 316 Hz B. 632 Hz C. 158 Hz D. 215 Hz E. 79 Hz
Bats can detect small objects such as insects that are of a size on the order of a wavelength. If bats emit a chirp at a frequency of 60 kHz and the speed of soundwaves in air is 330 m/s, what is the smallest size insect they can detect?
A. 1.5 mm B. 3.5 mm C. 5.5 mm D. 7.5 mm E. 9.8 mm
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What will be an ideal response?
A radio transmitter broadcasts at a frequency of 200,000 Hz. What is the wavelength of the wave?