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In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antena is 70m, then the minimum height of the transmitting antenaa should be – (Radius of the Earth = 6.4 × 10 6 m).

1. 32 m
2. 51 m
3. 40 m
4. 20 m

Correct answer: 32 m

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