Physics
Observe the given picture carefully and answer the following questions.
(a) Label the various components in the picture.
(b) What does this picture represent?
(c) What happens when the switch is turned off?
(d) Explain why does this happen.
Magnetism
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Answer
(a) The labelled picture is shown below :
(b) This picture represents an electromagnet.
(c) When the switch is turned off, the current stops flowing through the coil and the soft iron bar loses its magnetism.
(d) The soft iron bar becomes magnetised only when current passes through the coil so when the current stops, the magnetic field disappears and the bar no longer behaves like a magnet.
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Property of Magnets Explanation Correction(s) Attractive property A magnet attracts all kinds of materials. Directive property The end of the magnet pointing towards the geographical north is the south pole and the end of the magnet pointing towards the geographical south is the south pole. Coexistence of poles When a magnet is broken into a half, the north pole and south pole are separated. True test for magnetism Like poles of the magnet attract each other while unlike poles repel each other. Strength of the magnet The strength of the magnet is uniform throughout its length.