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(1) Assertion (A) is True, Reason (R) is True; Reason (R) is a correct explanation for Assertion (A)
(2) Assertion (A) is True, Reason (R) is True; Reason (R) is not a correct explanation for Assertion (A)
(3) Assertion (A) is True, Reason (R) is False.
(4) Assertion (A) is False, Reason (R) is True.
Assertion (A): The differential equations of an electromagnetic wave can be given as
\[
\left(\frac{\partial^{2} E}{\partial x^{2}}\right)=\mu_{0} \varepsilon_{0}\left(\frac{\partial^{2} E}{\partial t^{2}}\right) ;\left(\frac{\partial^{2} B}{\partial x^{2}}\right)=\mu_{0} \varepsilon_{0}\left(\frac{\partial^{2} B}{d t^{2}}\right)
\]
Reason (R): The wave equation of en waves are similar to standing waves.
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