Chapter Name: Electromagnetism
Activity Name: Oersted experiment in Electromagnetism
The Oersted experiment demonstrates the relationship between electricity and magnetism by showing the deflection of a magnetic compass needle when a current-carrying wire is placed nearby. The experiment also explores the concept of magnetic fields.
- Thermocole sheet
- Two thin wooden sticks (1 cm height) with slits at the top
- Copper wire (24 gauge)
- 3 (or 9) volt battery
- Key (switch)
- Magnetic compass
- Bar magnet
Step by Step Procedure:
- Fix the two thin wooden sticks vertically on a thermocole sheet and create slits at the top of their ends.
- Thread the copper wire through the slits so that it forms a circuit.
- Set up the circuit with the 3 (or 9) volt battery, key, and copper wire connected in series.
- Place the magnetic compass below the copper wire circuit.
- Bring the bar magnet close to the compass needle.
- Observe and record any deflection of the compass needle caused by the bar magnet.
- Move the bar magnet away from the circuit and switch on the circuit.
- Look for changes in the position of the compass needle.
- Observe and record any changes in the position of the compass needle caused by the current-carrying wire.
- The compass needle gets deflected when the bar magnet is brought close to it.
- The compass needle shows changes in position when the circuit is switched on.
- Handle the electrical circuit and components carefully to avoid accidents.
- Make sure the compass is level and not obstructed during the experiment.
Lesson Learnt from Experiment:
The experiment demonstrates that a current-carrying wire produces a magnetic field around it, and this magnetic field can interact with a magnetic compass needle, causing it to deflect. It confirms the relationship between electricity and magnetism, as discovered by Hans Christian Oersted.