First slide

Force on a charged particle moving in a magnetic field

Question

An electron is travelling horizontally towards east. A magnetic field in vertically downward direction exerts a force on the electron along

Easy

A

East
B

West
C

North
D

South

Solution

Fleming's left hand rule is used to determine the direction of force.
$\begin{array}{l} (- e) (\vec{v} \times \vec{B}) = \vec{F} \\ (\vec{v} \times \vec{B}) i s d i r e c t e d t o w a r d s n o r t h . \\ T h e r e f o r e - (\vec{v} \times \vec{B}) i s d i r e c t e d t o w a r d s s o u t h . \end{array}$

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