Question

When an electrical current is flowing through an electromagnet, it encounters resistance. The resistance in the electromagnet can be reduced by

a) using a thicker wire of the same material
b) connecting both ends of the wire to the positive terminal
c) using a battery with higher voltage
d) removing the core from the looped wire

Answer 1

Using a thicker wire of the same material can reduce the resistance in an electromagnet.

Step-by-step explanation:

In an electromagnet, the resistance can be reduced by using a thicker wire of the same material. This is because a thicker wire has a lower resistance due to its larger cross-sectional area, allowing for easier flow of current. Connecting both ends of the wire to the positive terminal of a battery does not reduce resistance, but rather increases the current flowing through the wire. Using a battery with higher voltage also does not reduce resistance, but it increases the potential difference, which in turn increases the current. Removing the core from the looped wire does not reduce resistance either, as the core helps to enhance the strength of the magnetic field.