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4.Moving Charges and Magnetism
easy
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
A
$1.6 \times 10^{15}\, m / s$
B
$6 \times 10^{-16}\, m / s$
C
$3.75 \times 10^{3}\, m / s$
D
$3.75 \times 10^{2}\, m / s$
Solution
(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$.
Standard 12
Physics
