Two long straight parallel wires separated by a distance of 20 cm carry currents of 30 A and 40 A in opposite directions. What is the magnitude of the resulting magnetic field at a point that is 15 cm from the wire carrying the 30-A current and 25 cm from the other wire?
a. 51 mT
b. 33 mT
c. 72 mT
d. 64 mT
e. 46 mT
B
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The greatest variation in size, mass, and luminosity occurs in
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A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20° above the horizontal. How far does the jumper jump?
A) 3.4 m B) 6.2 m C) 9.4 m D) 15 m E) 18 m
When two identical waves arrive at the same place in phase, there is
a. constructive interference. b. destructive interference. c. diffraction. d. a Doppler effect. e. a shock wave.