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DevinPermanent magnet moving coil (PMMC) instruments use a moving coil that is suspended between the poles of a permanent magnet, whereas moving iron instruments use a stationary coil and a moving iron piece that moves within the coil's magnetic field. PMMC instruments are more accurate but have limited range, while moving iron instruments are less accurate but can measure higher currents. PMMC instruments are inherently more expensive compared to moving iron instruments.
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Does Magnetic forces act when electrons move?
Yes, when electrons move, they create a magnetic field and are subject to magnetic forces. This is known as electromagnetism, which describes the relationship between electric and magnetic fields. Electrons moving in a conductor, for example, can generate a magnetic field that interacts with other magnets or conductors.
When does a magnet affect another magnet something made of iron or a similar metal and moving charges?
A magnet affects another magnet, iron, or a similar metal through the interaction of their magnetic fields. Moving charges also create magnetic fields that can be influenced by a magnet's field. This interaction occurs when there is relative motion between the magnetic sources.
What are the parts of galvanometer and its function?
The main parts of a galvanometer include a moving coil, a permanent magnet, a spring, a pointer, and a scale. The moving coil carries the current to be measured and is deflected by the magnetic field produced by the permanent magnet. The deflection of the coil causes the pointer to move across the scale, indicating the magnitude of the current.
How can you induce current in a wire using a permanent magnet?
By moving the wire perpendicular to the magnetic field lines created by the permanent magnet, you can induce a current in the wire through electromagnetic induction. The changing magnetic field as the wire moves induces an electric field, resulting in a current flow in the wire according to Faraday's law.
How can you use a magnet to induce a current?
You can induce a current in a wire by moving the magnet in and out of the coil or by moving the coil near the magnet. The changing magnetic field created by the moving magnet induces a current in the wire according to Faraday's law of electromagnetic induction.
