29. Sources of Magnetic Field

Magnetic Force Between Parallel Currents

29. Sources of Magnetic Field

Magnetic Force Between Parallel Currents

Guided videos.

Two very long wires of unknown lengths are a parallel distance of 2 m from each other. If both wires have 3 A of current flowing through them in the same direction, what must the force per unit length on each wire be?

BONUS:Is the mutual force between the wires attractive or repulsive?

Two long parallel wires lie in the x-y plane, and each carry

5.0 A

currents in opposite directions. Wire 1 lies along the

y = 3.0 cm

line and carries a current in the positive x direction; wire 2 lies along the y = 0

y = 0

line and carries a current in the negative x direction. What is the magnitude of the magnetic field at the point (

0 cm

1.5 cm

0 cm

346

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Textbook Question

. Two long, parallel wires are separated by a distance of 0.400 m (Fig. E28.29). The currents I1 and I2 have the directions shown. (b) Each current is doubled, so that I1 becomes 10.0 A and I2 becomes 4.00 A. Now what is the magnitude of the force that each wire exerts on a 1.20-m length of the other?

457

views

Textbook Question

. Two long, parallel wires are separated by a distance of 0.400 m (Fig. E28.29). The currents I1 and I2 have the directions shown. (a) Calculate the magnitude of the force exerted by each wire on a 1.20-m length of the other. Is the force attractive or repulsive?

586

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Textbook Question

Four, long, parallel power lines each carry 100-A currents. A cross-sectional diagram of these lines is a square, 20.0 cm on each side. For each of the three cases shown in Fig. E28.25

, calculate the magnetic field at the center of the square.

A 175-g model airplane charged to 18.0 mC and traveling at 2.8 m/s passes within 7.8 cm of a wire, nearly parallel to its path, carrying a 25-A dc current. What acceleration (in g’s) does this interaction give the airplane?.

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Textbook Question

In Fig. 28–57 the top wire is 1.00-mm-diameter copper wire and is suspended in air due to the two magnetic forces from the bottom two wires. The current is 35.0 A in each of the two bottom wires. Calculate the required current in the suspended wire (M).

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29. Sources of Magnetic Field

Magnetic Force Between Parallel Currents

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