A particle of charge $q$ and velocity $v$ passes undeflected through a space with non-zero electric field $E$ and magnetic field $B$. The undeflecting conditions will hold if.
Asigns of both $q$ and $E$ are reversed.
Bsigns of both $q$ and $B$ are reversed.
Cboth $B$ and $E$ are changed in magnitude, but keeping the product of $|B|$ and $|E|$ fixed.
Dboth $B$ and $E$ are doubled in magnitude.
Medium
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Dboth $B$ and $E$ are doubled in magnitude.
d both $B$ and $E$ are doubled in magnitude
$\overrightarrow{ F _{ e }}=\operatorname{qeB} \hat{n}$
$\overrightarrow{ F _{ e }}= qvB (-\hat{ n })$
Thus it both $E$ and $B$ are doubled the above conditions are not affected.
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