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
A$Hqv$ Newton’s in the direction of the magnetic field
B$Hqv$ dynes in the direction of the magnetic field
C$Hqv$ Newton’s at right angles to the direction of the magnetic field
D
Zero
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D
Zero
d (d) $\overrightarrow F = q(\overrightarrow {v\,} \times \overrightarrow B ) = 0$ as $\overrightarrow {v\,} $ and $\overrightarrow B $ are parallel.
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