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The velocity of certain ions that pass undeflected through crossed electric field $E=7.7 \mathrm{k} \mathrm{V} / \mathrm{m}$ and magnetic field $B=0.14 \mathrm{~T}$ is
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$55 \mathrm{~km} / \mathrm{s}$
$55 \mathrm{~km} / \mathrm{s}$
As velocity $v=\frac{E}{B}=\frac{7.7 \times 10^3}{0.14}=55 \mathrm{~km} / \mathrm{s}$
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