Your teacher has shown you the following activity.
Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the Figure 14.3. The current is switched on and some pins are placed near the ends of the nail.
Write down any three questions that come to your mind about this activity.
The following question will come into my mind:
•Why does the iron nail attract the pins?
•What will happen if we increase/decrease the current?
•Does the pin remain attached when we switch off the circuit?
•If we use other material such as wood etc. in place of the iron nail; what change will happen?
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