An electromagnetic wave in vaccum has the electric and magnetic fields $straight E with rightwards arrow on top$ and $straight B with rightwards arrow on top$ which are always perpendicular to each other. the direction of polarisation is given by $straight x with rightwards arrow on top$ and that of wave propagation by $straight k with rightwards arrow on top$ then

$straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space straight x space straight E with rightwards arrow on top$
$straight X with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space and straight k with rightwards arrow on top vertical line vertical line space straight E with rightwards arrow on top straight x straight B with rightwards arrow on top$
$straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top$
$straight X with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line space straight B with rightwards arrow on top space straight X space straight E with rightwards arrow on top$

Solution

straight X with rightwards arrow on top vertical line vertical line straight B with rightwards arrow on top space and space straight k with rightwards arrow on top vertical line vertical line straight E with rightwards arrow on top space straight x straight B with rightwards arrow on top

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