First slide

Force on a charged particle moving in a magnetic field

Question

An electron-beam passes through a magnetic field B of 2x10^-3 Weber/m² and an electric field E of 3.4x10⁴ volt / met re acting simultaneously. If the path of the electron remains undeviated, the speed of the electron will be

Easy

A

1.7 x 10⁷m/s
B

4.7 x 10⁷ m/s
C

7.1 x 10⁷m/s
D

3.0 x 10⁸ m/s

Solution

Be v = e E
$V = \frac{E}{B} = \frac{3 \cdot 14 \times 10^{4}}{2 \times 10^{- 3}} = 1 \cdot 7 \times 10^{7} m / s$

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