Final answer:
To weaken an induced magnetic field, you can d. decrease the current or increase the length of the wire or the size of the loop, which would spread the magnetic field over a larger area.
Step-by-step explanation:
The question at hand involves understanding how to make the induced magnetic field strength weaker. According to Faraday's law of electromagnetic induction, the induced field is influenced by the current as well as the dimensions of the loop through which the field is passing. Specifically, to make the induced magnetic field strength weaker, one would need to either decrease the current or increase dimensions that are inversely related to the field strength, such as the length of the wire in the coil.
The correct answer from the given options is d. Decrease the current and increase the length. This can be understood by considering that a decreased current results in a lower magnetic field produced by the current's path (e.g., a coil), and increasing the length of wire, or the size of the loop, decreases the field strength at any given point because the magnetic field lines are spread over a larger area.
SUMUP:
- Decrease the current flowing through the wire loop to weaken the induced magnetic field.
- Increase the length of the wire or the size of the loop to distribute the field over a larger area, thus reducing the field's strength.