Magnet is not used in- 1) Electric bulb, 2) Electric Motor, 3) Loudspeakers, 4) All of these
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Magnetic field can be produced by any of the following methods: (i) Any magnet-bar magnet, horse-shoe magnet or round magnet can be used. (ii) A wire carrying current produces a field around it. (iii) A loop or solenoid carrying current.
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Bar magnet stands out of the others.
Loudspeaker, microphone and electric motor make use of electromagnets.
Bar magnet, on the other hand, is a permanent magnet and makes no use of the electromagnets.
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