An electron (charge $q$ $coulomb$) enters a magnetic field of $H$ $weber/{m^2}$ with a velocity of $v\,m/s$ in the same direction as that of the field the force on the electron is
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(d) $\overrightarrow F = q(\overrightarrow {v\,} \times \overrightarrow B ) = 0$ as $\overrightarrow {v\,} $ and $\overrightarrow B $ are parallel.
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