Answer:
Need for modulating a signal: (i) To reduce length of transmitting antenna to practical heights \[(l\simeq \lambda /4)\]. (ii) To increase the power radiated by an antenna \[(P\propto 1/{{\lambda }^{4}})\] so as to increase the range of transmission. (iii) To convert a wide band signal into a narrow band signal. (iv) To transmit simultaneously a large number of audio signals from the same antenna without getting them mixed up.
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