Two parallel conductors are carrying currents in the same direction. The currents are non-zero and not necessarily equal. The magnitude of the magnetic field midway between them is 40 μT. If one of the currents then has its direction reversed, what is the resulting magnitude of the magnetic field midway between them?

The magnitude of magnetic field decreases in comparison to previous case.

Explanation:

Let current flowing  in two conductors  are and

Magnetic field in wire,

Magnetic field due to current I1

Magnetic field due to current I2

When two parallel conductors are carrying currents in the same direction  then the magnetic field will be added.

When the  direction of one of the current is reversed  then  the magnitude of the  magnetic field midway between them

Hence, the magnitude of magnetic field decreases in comparison to previous case.

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

hope that !                                         : )

god i hope this !