Question
Which of the following will induce EMF in a loop of wire?
*
1 point
holding the loop stationary in a constant magnetic field
rotating the loop in a magnetic field
moving the loop parallel to a magnetic field
moving the loop perpendicular to an electric field
*
1 point
holding the loop stationary in a constant magnetic field
rotating the loop in a magnetic field
moving the loop parallel to a magnetic field
moving the loop perpendicular to an electric field
Answers
GPT-4o mini
To determine which actions induce electromotive force (EMF) in a loop of wire, we need to consider Faraday's law of electromagnetic induction. According to Faraday's law, an EMF is induced in a loop when there is a change in magnetic flux through the loop.
1. **Holding the loop stationary in a constant magnetic field**: This will not induce EMF because there is no change in magnetic flux.
2. **Rotating the loop in a magnetic field**: This will induce EMF as the orientation of the loop relative to the magnetic field changes, leading to a change in magnetic flux through the loop.
3. **Moving the loop parallel to a magnetic field**: This typically will not induce EMF, because if the motion is parallel, there is no change in magnetic flux through the loop.
4. **Moving the loop perpendicular to an electric field**: This would not induce EMF. The motion of the loop does not involve a magnetic field changing flux through the loop.
The correct answer is **rotating the loop in a magnetic field**.
1. **Holding the loop stationary in a constant magnetic field**: This will not induce EMF because there is no change in magnetic flux.
2. **Rotating the loop in a magnetic field**: This will induce EMF as the orientation of the loop relative to the magnetic field changes, leading to a change in magnetic flux through the loop.
3. **Moving the loop parallel to a magnetic field**: This typically will not induce EMF, because if the motion is parallel, there is no change in magnetic flux through the loop.
4. **Moving the loop perpendicular to an electric field**: This would not induce EMF. The motion of the loop does not involve a magnetic field changing flux through the loop.
The correct answer is **rotating the loop in a magnetic field**.