Electromagnetic Waves Ques 2
2. The electric and the magnetic field associated with an E.M. wave, propagating along the $+z$-axis, can be represented by
[2011]
(a) $[\overrightarrow{{}E}=E_0 \hat{i}, \overrightarrow{{}B}=B_0 \hat{j}]$
(b) $[\overrightarrow{{}E}=E_0 \overrightarrow{{}k}, \overrightarrow{{}B}=B_0 \hat{i}]$
(c) $[\overrightarrow{{}E}=E_0 \hat{j}, \overrightarrow{{}B}=B_0 \hat{i}]$
(d) $[\overrightarrow{{}E}=E_0 \hat{j}, \overrightarrow{{}B}=B_0 \hat{k}]$
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Answer:
Correct Answer: 2.(a)
Solution:
- (a) E.M. wave always propagates in a direction perpendicular to both electric and magnetic fields. So, electric and magnetic fields should be along $+X$ and $+Y$-directions respectively. Therefore, option (a) is the correct option.
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