Which of the following are found in the receiver but not in the microphone of a telephone handset? i. Diaphragm. ii. soft iron pole pieces. iii. permanent magnet. iv.carbon blocks
i and ii
i and iv
ii and iii
iii and iv
Explanation
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Green Bri
The receiver and microphone are two essential parts of a telephone handset. The microphone converts sound waves into electrical signals, while the receiver converts electrical signals into sound waves. In the microphone, sound waves cause a diaphragm to vibrate, which then changes the pressure on carbon blocks, varying the electrical resistance of the blocks. This variation in electrical resistance produces electrical signals that correspond to the sound waves.
In the receiver, electrical signals produced by the microphone are transmitted to a coil of wire that surrounds a magnet. The electrical signals cause the coil to create a magnetic field that interacts with the permanent magnet. This interaction causes a diaphragm to vibrate, which produces sound waves that correspond to the original sound.
From this explanation, we can see that the diaphragm is found in both the receiver and the microphone. The permanent magnet is found in the receiver, but not in the microphone. The soft iron pole pieces are also found in the receiver, but not in the microphone. The only component that is found in the microphone but not in the receiver is the carbon blocks. Therefore, the answer is option (ii) i and iv.
The answer is between A or C because
The parts found in the receiver but not in the microphone of a telephone handset are the diaphragm, soft iron pole pieces, and permanent magnet. These parts work together to turn electrical signals into sound waves that we can hear. Carbon blocks, which are used to turn sound waves into electrical signals, are found in the microphone.
The answer is not in the options following the explanation provided the should be only the permanent magnet that is III.
The correct answer is C.
In a telephone handset, the microphone and the receiver have different components because they serve different functions. Here's a breakdown of the components listed and their typical locations:
i. Diaphragm: Found in both the microphone and the receiver. In the microphone, it converts sound waves into electrical signals. In the receiver, it converts electrical signals back into sound waves.
ii. Soft iron pole pieces: Found in the receiver. These are part of the receiver's electromagnetic mechanism that moves the diaphragm to produce sound.
iii. Permanent magnet: Found in the receiver. It interacts with the soft iron pole pieces and the coil to move the diaphragm and produce sound.
iv. Carbon blocks: Found in the microphone. Traditional carbon microphones use carbon granules to vary the resistance in response to sound waves, thereby converting sound into an electrical signal.
So, the components found in the receiver but not in the microphone of a telephone handset are: ii. Soft iron pole pieces and iii. Permanent magnet
