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Question
You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch.
- Draw a circuit diagram to represent the process.
- Label the poles of the electromagnet.
Solution
- Wind an insulated copper coil around iron bar AB several times. As indicated, connect the cell, switch, and rheostat in series. The key bar turns into a magnet when pressed.
- End A, S-pole and end B-N-pole.
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