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 m...

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

Answer Details

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.