Two metal rings lie side-by-side on a table (Figure 22.59). The current in the left ring runs clockwise and is increasing with time, so a current runs in the right ring. Does this current run clockwise or counterclockwise? Explain, using a diagram. (Hint: Think carefully about the direction of magnetic field in the right ring produced by the left ring, taking into consideration what sections of the left ring are closest.)

Let the digits of the right-hand curl in the direction of the conventional current and the thumb will point in the direction of the magnetic field at any point on the axis.

Using the special right-hand rule for current loops, the magnetic field produced by the loop on the left is to the side of the loop on the right.

The direction of magnetic fields and induced current direction as shown below figure.

Lenz's law states that the change is the magnitude of the magnetic field relative to the coil. The induced current must be in such a direction as to produce a force opposite to the motion of the bat magnet.

Because the magnetic field is produced by the left side, the loop is on the page on the right side of the loop, and the current in the left ring runs clockwise and increases with time, the magnetic field increases, so the induced current must be clockwise to produce a force against the direction of the magnetic field due to the left side loop.