Please ans there......

Solution
Considering undedicated as undiflected
as we know the Lorentz force on a moving charge particle simultaneously in electric and magnetic field

\vec{F} = {\vec{F}}_{m a g n e t i c} + {\vec{F}}_{e l e c t r i c}

where F_magnetic is magnetic force on moving charge and F_electric is electric force on charge. So particle is undeflected so net force (Lorentz force) on charge will be zero.
So

\vec{F} = {\vec{F}}_{L o r e n t z} = 0

So option (c) must be incorrect.

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