Question

Which of the following scenarios best illustrates Lenz's law?

a. A bar magnet is dropped through a coil of wire. The induced current in the coil produces a magnetic field that opposes the motion of the magnet, slowing it down.

b. A coil of wire is placed in a changing magnetic field. The induced current in the coil produces a magnetic field that reinforces the original magnetic field, strengthening it.

c. A conducting loop is rotated in a stationary magnetic field. The induced current in the loop produces a magnetic field that is perpendicular to both the original magnetic field and the motion of the loop.
d. none of the above

Answer 1

Lenz's law states that the direction of an induced current is such that it opposes the change in magnetic flux. In option a, when a bar magnet is dropped through a coil of wire, the induced current in the coil produces a magnetic field that opposes the motion of the magnet, slowing it down.

Step-by-step explanation:

Lenz's law states that the direction of an induced current is such that it opposes the change in magnetic flux that produced it. From the given scenarios, the best illustration of Lenz's law is option a. When a bar magnet is dropped through a coil of wire, the induced current in the coil creates a magnetic field that opposes the motion of the magnet, slowing it down.