Question: Q. 6. 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 (a) $\frac{1}{r^{3}}$. (b) $\frac{1}{r^{2}}$. (c) $\frac{1}{r}$. (d) remains constant.
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Solution:
Ans. Correct option : (c)
[NCERT Exemplar]
Explanation: A diode antenna radiates the electromagnetic waves outwards. The amplitude of electric field vector $\left(E_{0}\right)$ which transports significant energy from the source falls intensity inversely as the distance $(r)$ from the antenna. As we know that electromagnetic waves are radiated from dipole antenna and radiated energy $E \propto \frac{1}{r}$.
Very Short Answer Type Questions
(1 mark each)
[1] Q. 1. Name the current which can flow even in the absence of electric charge
U] [ SQP 2018, SQP II 2017; NCERT Exemplar]
Ans. Displacement Current.
[CBSE Marking Scheme 2018]
