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A plane E.M wave of frequency $40 M H z$ travels along x-axis. At same point at same instant, the electric field ‘E’ has maximum value of 660 N/C in y-direction. The magnitude and direction of magnetic field is

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$2.5 μ T a l o n g z - a x i s$

$2.5 μ T a l o n g x - a x i s$

$3.3 n T a l o n g z - a x i s$

$2.2 μ T a l o n g z - a x i s$

answer is C.

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Detailed Solution

$B_{0} = \frac{E_{0}}{C} = \frac{660}{3 \times 10^{8}} = 2.2 μ T$

Here c is along x axis and E is along Y axis.

$\hat{i} = \hat{j} \times \hat{k} a s c = E \times B$

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