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Question
A loudspeaker doesn't have a ________.
A loudspeaker doesn't have a ________.
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Solution
The correct option is B temporary magnet
A loudspeaker has: a coil to create magnetic field; a permanent magnet on which the coil is wound; a screen which vibrates with the movement of coil; a reflector to direct the sound in a particular direction. Clearly, a loudspeaker doesn't have a temporary magnet.
A loudspeaker has: a coil to create magnetic field; a permanent magnet on which the coil is wound; a screen which vibrates with the movement of coil; a reflector to direct the sound in a particular direction. Clearly, a loudspeaker doesn't have a temporary magnet.
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