Final answer:
To predict whether a current will be induced, use Lenz's law which states that the induced current will oppose the change in magnetic flux. Follow a step-by-step problem-solving strategy to determine the direction of the induced current.
Step-by-step explanation:
To predict whether a current will be induced in a given situation, we can use Lenz's law. Lenz's law states that the induced current will flow in a direction that opposes the change in magnetic flux. Here's a step-by-step problem-solving strategy for using Lenz's law:
- Make a sketch of the situation to visualize and record directions.
- Determine the direction of the applied magnetic field.
- Determine whether the magnetic flux is increasing or decreasing.
- Determine the direction of the induced magnetic field, which opposes the change in magnetic flux.
- Use the right-hand rule to determine the direction of the induced current that is responsible for the induced magnetic field.
- The direction of the induced emf can now drive a conventional current in this direction.