A1-m-long monopole car radio antenna operates in the am frequency of 1.5 mhz. how muchcurrent is required to transmit 4 w of power?

The current needed to transmit Power of 4 W is 28.47 A

Solution:

As per the question:

Length of the antenna,

Frequency,

Power transmitted,

Now,

For a monopole antenna:

where

= wavelength transmitted by the antenna

c = speed of light in vacuum

Now,

Since, the value of >> thus the monopole is a Hertian monopole.

The resistance is calculated as:

Now, the current I is given by:

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2