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Answer:
C. Increase the voltage of the battery
Explanation:
To make the magnet stronger, we need to increase the current, so by ohm's law, we get:
[tex]V=IR[/tex]Where V is the voltage, I is current, and R is the resistance. So, to increase current, we can increase the voltage.
Therefore, the magnet will be stronger if we increase the voltage of the battery.