Ncert Exercises & Solutions

An EM wave radiates outwards from a dipole antenna, with \(E_0\), as the amplitude of its electric field vector. The electric field \(E_0\), which transports significant energy from the source falls off as:
1. \(\dfrac{1}{r^3}\)
2. \(\dfrac{1}{r^2}\)
3. \(\dfrac{1}{r}\)
4. remains constant

(c)

Hint: The magnitude of the electric field depends on the distance from the source.

Step 1: Find the dependence of the electric field on the distance.

From a diode antenna, the electromagnetic waves are radiated outwards. The amplitude of electric field vector (

E_{0}

) which transports significant energy from the source falls off inversely as the distance(r) from the antenna, i.e.,

E_{0}

\propto \frac{1}{r}

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