First slide

Force on a charged particle moving in a magnetic field

Question

A uniform magnetic field B and a uniform electric field E act in a common region. An electron is entering this region of space . The correct arrangement for it to escape undeviated is

Moderate

A
B
C
D

Solution

For undeviated motion, $|{\vec{F}}_{e}| = |{\vec{F}}_{m}|,$ which happened when $\vec{v}, \vec{E} and \vec{B}$ are mutually perpendicular to each other.

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