# Propagation

### Explanation of question 1

In Fig. 21.1,

- i the field around the antenna is the magnetic field H
- ii the distance l is equal to

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii strue
4. i and ii are both false

The answer is :- 2 The magnetic field is around a conductor (antenna). The alternating nature of the signal means that the direction is continually being reversed. The distance between two concentric circles where the arrows are in the same direction equates to one wavelength, , therefore .

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