You move a bar magnet two inches through a coil of wire. What do you observe in a galvanometer hooked up to the coil?
The pointer moves one direction and then stops in that position.
The pointer moves one direction and then goes back to center.
The pointer swings one way and then swings the other way.
The pointer does not move.
https://ru-clip.net/video/vwIdZjjd8fo/electromagnetic-induction-and-faraday-s-law.html
So if you move it in, and stop it, ammeter deflects one way, returns to zero.
When a bar magnet is moved through a coil of wire, it creates a changing magnetic field across the coil. According to Faraday's law of electromagnetic induction, this changing magnetic field induces an electric current in the coil. The galvanometer, which is a device used to detect and measure small electric currents, is hooked up to the coil.
In this scenario, as the bar magnet moves through the coil, you will observe a deflection in the galvanometer's pointer. The specific behavior of the pointer depends on the direction and magnitude of the induced current.
Given the options provided:
- If the pointer moves in one direction and then stops in that position, it suggests that a current was induced in the coil, but it quickly reached a steady state and stopped flowing. This could happen if the magnet was moved at a constant velocity through the coil.
- If the pointer moves in one direction and then goes back to the center, it means that the current was induced initially, but then the magnet was either moved back to its original position or the direction of motion was reversed. As a result, the induced current changes direction, causing the pointer to return to the center.
- If the pointer swings one way and then swings the other way, it indicates that the induced current changes direction as the magnet moves through the coil.
- If the pointer does not move at all, it means that no current was induced in the coil. This could happen if the magnet is not moving, it is not in close proximity to the coil, or the coil does not have a complete electrical circuit.
So, based on the observation of the galvanometer's pointer, the correct answer would be: "The pointer swings one way and then swings the other way."