SATHEE: electromagnetic-waves Question 5

electromagnetic-waves Question 5

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 $(E_{0})$ 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]

Electromagnetic Waves

electromagnetic-waves Question 5

Very Short Answer Type Questions

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Electromagnetic Waves

electromagnetic-waves Question 5

Very Short Answer Type Questions

Table of Contents

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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