Two parallel wires carry currents in opposite directions as shown in the figure

Question

Two parallel wires carry currents in opposite directions as shown in the figure below. Which of the following statements is correct? The force on the i2 wire is upward, and the force on the i1 wire is downward. Neither wire experiences a net force. The force on the i2 wire is downward, and the force on the i1 wire is upward. The force on the i2 wire is upward, and the force on the i1 wire is upward. The force on the i2 wire is downward, and the force on the i1 wire is downward. First, find the magnetic field produced by each wire. (There is a right-hand rule that can be used to remember the direction of the field produced by a current.) Next, find the resulting magnetic force on each wire, due to the field from the other wire. (There is another right-hand rule for finding the direction of the magnetic force on an electric current.)

Explanation / Answer

For the upwads current ,

the magnetic field due to upper wire at the location of lower wire is INTO the page ,

Now, as F = iL X B

for the lower wire , direction of force is Downwards ,

now, using newtons third law ,

force on upper wire is upwards.

Option(3)

force on i2 is downwards

and force on i1 is upwards

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