figure shows equipments used to demonstrate electromagnetic induction. two pieces of soft iron core 'A' and 'B' each having a coil of insulated wire wrapped around them. the coil around 'A' is connected to a switch and a cell. the coil around 'B' is connected to a galvanometer shows a rapid deflection to the left before returning to zero (i) explain why the galvanometer shows a rapid deflection to the left before returning to zero? (ii) explain what if anything would be observed on the galvanometer as the switch is opened?
Answers
Answer:
An electromagnet is simply a coil of wire. It is usually wound around an iron core. However, it could be wound around an air core, in which case it is called a solenoid. When connected to a current source, the electromagnet becomes energized, creating a magnetic field just like a permanent magnet. The magnetic flux density is proportional to the magnitude of the current flowing in the wire of the electromagnet.
The polarity of the electromagnet is determined by the direction of current. The north pole of the electromagnet is determined by using our right hand. If we wrap our fingers around the coil in the same direction as the current is flowing (conventional current flows from + to -). The direction our thumb is pointing is the direction of the magnetic field, so north would come out of the electromagnet in the direction of our thumb. Above is the circuit diagram of an electromagnet.
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Answer:
The galvanometer deflects and returns to zero when coil B is connected.
When the galvanometer switch is opened the pointer travels to the other side.
Explanation:
The initial continuous current flow will cause the galvanometer to be deflected, but as soon as the key is unplugged, the current drops to zero. The magnetic field in coil A changes as a result of this change in current.
As a result, coil B will experience an induced emf, which will cause the galvanometer to deflect and then return to zero.
When the switch is opened, the galvanometer pointer travels to the other side, indicating that the temporarily produced current's direction has changed. Electromagnetic induction is what is happening in this situation. The magnetic field connected to coil A changes when the current is passed through coil B or when it is interrupted, and as a result, an induced current is generated in the coil.
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