Final answer:
The voltage across the wired coil changes when the frequency is varied. This is due to electromagnetic induction, where a change in the magnetic field within a coil of wire induces a voltage across the coil. As the frequency increases, the rate of magnetic field change increases, leading to a higher induced voltage.
Step-by-step explanation:
Yes, the voltage across the wired coil would change when the frequency is varied. This is due to the principle of electromagnetic induction, originally discovered by Faraday. According to this principle, a change in the magnetic field within a coil of wire induces a voltage across the ends of the coil. When you put the wired coil on top of the circuit board coil and alter the frequencies, you're changing the magnetic field's rate of oscillation. In this experiment, when the frequency is increased from 1500 Hz to 5000 Hz, the rate of change of magnetic field increases. This means more voltage is induced across the ends of the wired coil due to the increased rate of magnetic field change. Therefore, you would observe a higher voltage measured on the voltmeter at the end of the wired coil.
Learn more about Electromagnetic Induction