Electromagnetic Induction and Voltmeter Readings
What happens to the VOM as you thrust the magnet?
Does it show reading once the magnet is inside the coil?
What is needed to maintain the reading in the VOM?
What happens when you thrust the north pole of the magnet into the coil in the opposite direction?
When you thrust the magnet into the coil, it induces a changing magnetic field inside the coil. According to Faraday's law of electromagnetic induction, a changing magnetic field induces an electromotive force (EMF) in the coil, which in turn generates a current. The Voltmeter (VOM) shows a reading when the current flows through it.
To maintain the reading in the VOM, you need to keep the magnet moving inside the coil or change the magnetic field with respect to the coil. As long as there is relative motion between the magnet and the coil or a changing magnetic field, an induced current will flow through the coil, and the VOM will show a reading.
When you thrust the north pole of the magnet into the coil in the opposite direction, the induced current will flow in the opposite direction as well. The change in direction of the magnetic field or relative motion between the magnet and the coil will still cause electromagnetic induction, but the induced current will be reversed compared to the previous scenario. As a result, the VOM will show a reading with the opposite polarity compared to the previous case.
Electromagnetic induction is a fascinating phenomenon that explains how a changing magnetic field can induce an electric current in a conductor. When you thrust a magnet into a coil, you are essentially changing the magnetic field inside the coil, which results in the generation of an electric current.
This induced current is what causes the Voltmeter (VOM) to show a reading. The VOM measures the voltage or potential difference across the coil, which is a result of the induced current flowing through it. This is a practical application of Faraday's law of electromagnetic induction.
To maintain the reading in the VOM, you must ensure that there is continuous relative motion between the magnet and the coil or a changing magnetic field with respect to the coil. This movement or change in magnetic field keeps the induced current flowing, allowing the VOM to continue displaying a reading.
When you thrust the north pole of the magnet into the coil in the opposite direction, the induced current reverses its direction as well. This change in the direction of the current results in the VOM displaying a reading with the opposite polarity compared to when the magnet was initially thrust into the coil.
Understanding the relationship between electromagnetic induction, magnetism, and current flow is crucial in various applications, including electric generators, transformers, and more. By exploring the behavior of the VOM in response to changing magnetic fields, we can deepen our understanding of electromagnetism.