To create a larger current in the apparatus where a student coils a wire around a metal rod and attaches the ends of the wire to an ammeter, the student could alter the setup by increasing the number of times the wire is coiled around the rod. By increasing the number of coils, more wire length is involved in the circuit, which in turn increases the overall resistance. According to Ohm's Law (V = IR), when resistance increases, and voltage is constant, the current will increase.
Therefore, by increasing the number of coils, the resistance of the circuit increases, leading to a larger current flowing through the wire. This change effectively alters the apparatus to produce a larger current reading on the ammeter.
