To make a battery of two cells, the negative terminal of one cell is connected to the positive terminal of the other cell and not to the negative terminal. So this statement is false.
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. This statement is true. Using an electric fuse prevents the flow of unduly high electric current and protects the appliances from the damage.
This statement is false. An electromagnet attracts a piece of iron.
An electric bell has an electromagnet and it shown an oscillatory motion. As the hammer hits the bell and it vibrates rapidly.
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