2. This scientist's experiments helped determine that magnetism could produce electricity through a solenoid. Isaac Newton Michael Faraday Christian Orsted André-Marie Ampere

## Step 1<br />The question is asking us to identify the scientist who conducted experiments that demonstrated the relationship between magnetism and electricity, specifically through the use of a solenoid. A solenoid is a coil of wire that is tightly wound into a helix. When an electric current passes through it, it produces a magnetic field.<br /><br />## Step 2<br />Let's consider each of the given options:<br /><br />1. Isaac Newton: He is known for his laws of motion and universal gravitation, not for his work on magnetism and electricity.<br /><br />2. Michael Faraday: He is the correct answer. Faraday's experiments in the 19th century demonstrated that a changing magnetic field could induce an electric current in a conductor. This is the principle behind the operation of a solenoid.<br /><br />3. Christian Orsted: He is known for discovering that a compass needle is affected by an electric current, which was the first evidence of a relationship between electricity and magnetism. However, he did not work with solenoids.<br /><br />4. André-Marie Ampere: He is known for formulating Ampere's law, which relates the magnetic field around a closed loop to the electric current passing through the loop. However, he did not conduct experiments with solenoids.<br /><br />## Step 3<br />Based on the above analysis, the correct answer is Michael Faraday.