Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in the other wire is 30 A. The currents are in the same direction. If the 30-A current is increased to 50 A, by what factor does the magnitude of the magnetic field midway between the wires change?
a. 2
c. 25/9
b. 4
d. 5/3
A
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A plane is moving due north, directly towards its destination. Its airspeed is 200 mph. A constant breeze is blowing from west to east at 40 mph. How long will it take for the plane to travel 200 miles north?
a. one hour c. less than one hour b. more than one hour d. more information is needed
In the two-slit experiment, for the condition of bright fringes, the value of m = +2 corresponds to a path difference of ?
Indicate whether the statement is true or false
Fig. 15-2 shows the displacement of a wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. Determine the frequency of the wave
A) 4.0 Hz B) 0.50 Hz C) 3.0 Hz D) 0.33 Hz E) 0.25 Hz
For laminar flow in a circular tube, the velocity is given by
