A proton (or charged particle) moving with velocity $v$ is acted upon by electric field $E$ and magnetic field $B$. The proton will move undeflected if
A proton (or charged particle) moving with velocity $v$ is acted upon by electric field $E$ and magnetic field $B$. The proton will move undeflected if
- A
$E$ is perpendicular to $B$
- B
$E$ is parallel to $v$ and perpendicular to $B$
- C
$E$, $B$ and $v$ are mutually perpendicular and $v = \frac{E}{B}$
- D
$E$ and $B$ both are parallel to $v$
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