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Q.

In an electromagnetic wave, at an instant and at a particular position, the electric field is along the negative z-axis and magnetic field is along the positive x-axis. Then the direction of propagation of electromagnetic wave is :

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a

Positive y-axis

b

At 45^o angle from positive y-axis

c

Positive z-axis

d

Negative y-axis

answer is C.

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Detailed Solution

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$\bar{E} = E_{0} (- \hat{k})$ , $\bar{B} = B_{0} \hat{i}$

$Direction of propagation is along \bar{E} \times \bar{B} = E_{0} (- \hat{k}) \times B_{0} \hat{i} = E_{0} B_{0} (- \hat{j})$

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In an electromagnetic wave, at an instant and at a particular position, the electric field is along the negative z-axis and magnetic field is along the positive x-axis. Then the direction of propagation of electromagnetic wave is :