Iron bolts-Thin/Thick/ plastic pipe, copper wire turns (20,40,60), A battery of 2,3,4,5 cells, a switch, shoe nails.
Real Lab Procedure
- To make an electromagnet, take the enamelled copper wire and wind it tightly around the iron bolt in the form of a coil. Let it have 20 turns that run parallel to each other.
- Make 2 more electromagnets with 40 and 60 turns.
- Rub the free ends of the wires of each electromagnet with the sand paper to remove the enamel coating.
- Connect the electromagnet with 20 turns to a battery of 2 cells through a switch.
- Place some shoe nails near the end of the bolt and switch on the current.
- Count the number of nails attracted by this electromagnet.
- Switch off the current. Observe that the coil loses most of its magnetism though a few nails may still cling to the electromagnet.
- Repeat this activity with other electromagnets of 40 and 60 turns.
- Instead of an iron bolt, wind 60 turns of enamelled copper wire around a plastic pipe and observe if it acts as an electromagnet.
- Count the number of nails attracted by it.
- Select the number of turns of wire.
- Select the Number of electric cells.
- Select the core of electromagnet.
- Click on the check box to refer the circuit diagram.
- Drag and drop the copper wire from the top of the iron bolt towards the battery to connect it with the positive end of it.
- Drag and drop the copper wire from the bottom of the iron bolt towards the switch to connect it with one side of the switch.
- Drag and drop the copper wire from battery towards the switch to connect the negative end of it with the other end of the switch and complete the connection.
- Click on the switch to on the circuit.
- Drag and drop the dish containing iron nails towards the bottom of the iron bolt.
- Observe the number of nails attracted.
- Click on the switch to off the circuit and try other combinations to understand the difference in attraction.
- Click on the ‘Reset’ button to redo the experiment with different parameters.
- The electromagnet loses its magnetism when the electric current is switched off.
- Larger number of nails are attracted by the electromagnet with more number of turns.
- The electromagnet with plastic core attracted very less number of nails compared to the electromagnet with iron core.
- An electromagnet can be made by wrapping a wire around a piece of iron and passing current through it.
- The strength of an electromagnet depends upon the number of turns of the wire and the core used to make the electromagnet.