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Q.36

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

What is the net force (magnitude and direction) on each wire in n FIGURE EX29.36?

its direction is upward.

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Step by Step Solution

Step 1 : Given Information

Two current-carrying wires generate forces between since ordinary current produce magnetic fields and these fields exert significant forces on ordinary currents. The forces on the wires are equal in magnitude and its given by equation (29.27) in the form

Where is the distance between the two wires and is the length of wire. The force is attractive if the currents are in the same direction and repulsive if they are in opposite directions.

Wire 1 experiences force by wire 2 and 3 and both have current in opposite directions, so the force that is exerted on wire 1 is the difference between the forces if the both wires

Where and Now, we plug the values for these parameters to get get the force on wire 1

The positive sign indicates that the net force is upward.

Step 2 : Simplify

Wire 2 experiences force wire by 1 and 3 and both have current in the same direction, so the force that is exerted on wire 2 is the difference of the both wires

Where and . Now, we plug all the values for these parameters to get the force on wire 2

Step 3 : Calculation

Wire 3 experiences force by wire 1 and 2 and both have current in opposite directions, so the force that is exerted on wire 3 is the difference between the forces of both wires

where Now, we plug the values for these parameters to get the force on wire 3

The negative sign indicates that the net force is downward.

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