First slide

Force on a charged particle moving in a magnetic field

Question

A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength 20 Vm^-1 and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons ?

Easy

A

20 ms^-1
B

40 ms^-1
C

8 ms^-1
D

5.5 ms^-1

Solution

$Bev = eE or v = E / B$
$∴ V = \frac{20}{0 \cdot 5} = 40 m / s$

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