Fig. 28-6 shows two long, parallel current-carrying wires. The wires carry equal currents I1 = I2 = 20 A in the directions indicated and are located a distance d = 0.5 m apart. Calculate the magnitude and direction of the magnetic field at a point located at an equal distance d from each wire.
a. 4?T upward
b. 8?T upward
c. 4?T to the right
d. 8?T downward
e. 4?T downward
Answer: b. 8?T upward
B = 2?i/2?d cos60 = 2*2e-7*20/0.5 * 0.5 = 8 ?T upward
You might also like to view...
Austenitic stainless steel _________ ferromagnetic.
Fill in the blank(s) with the appropriate word(s).
Describe two experiments that provide evidence of space-time curvature by the presence of a mass
What will be an ideal response?
Two ropes are spliced together as shown.
A short time after the incident pulse shown in the diagram reaches the splice, the rope's appearance will be that in
A.
B.
C.
D.
E.
According to Newton's theory of gravity, why does the Moon have a much lower acceleration than a falling object on Earth?
a. Because the Moon is so heavy. b. Because the Moon is close to Earth's center. c. Because the Moon is lighter than Earth. d. Because the Moon is farther away from Earth's center than the object falling at Earth's surface. e. Because the Moon has its own gravitational field.