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A plane e.m. wave of frequency 40 MHz travels along X - axis. At some pint at some instant, the electric field E has maximum value of 750 N/C in Y - direction. The magnitude and direction of magnetic field is

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2.5µT along X - axis

2.5µT along Y - axis

2.5 µT along Z - axis

5 µT along Z - axis

answer is C.

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Detailed Solution

$\begin{aligned} \frac{750}{B} = 3 \times 10^{8} \\ B = \frac{750}{3 \times 10^{8}} = 250 \times 10^{- 8} \\ = 2.5 μ J along z - axis. \end{aligned}$

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