An electric field of $1500\, V / m$ and a magnetic field of $0.40\, weber / meter^2$ act on a moving electron. The minimum uniform speed along a straight line the electron could have is
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(c) When electron moves in both electric and magnetic field then $qE = qvB$.
$v = \frac{E}{B} = \frac{{1500}}{{0.40}} = 3750\,\,m/s$$ = 3.75 \times {10^3}\,m/s$.
$v = \frac{E}{B} = \frac{{1500}}{{0.40}} = 3750\,\,m/s$$ = 3.75 \times {10^3}\,m/s$.
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