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Question number 17
Electromagnets are widely used as components of electrical devices such as motors, generators, loudspeakers, hard disks, MRI machines, scientific instruments, etc.
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Question number 18
Working of an electric bell
Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core.
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