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Magnetic Effects of Electric Current

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Question 17

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

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Solution

Some of the questions can be
(i) Why does the nail attract the pins?
(ii) What will happen if we connect more cells in the circuit?
(iii) What will happen if we use some other material like a straw in place of the nail?
(iv) What will happen if we wrap the wire around the nail more tightly?

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Q. A student takes about one metre long insulated copper wire and winds it round and round closely on a large iron nail. He then connects the two ends of the wire to a battery. When a steel paper clip is brought near the iron nail, the iron nail attracts it due to which the steel clip sticks to the iron nail.
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Magnetic Effects of Electric Current

Standard VII Physics

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