A particle of mass m and charge q starts from rest and moves in an ...

Question

A particle of mass m and charge q starts from rest and moves in an electric field E = E$_{0}$ î . After travelling a distance x in the field along x-axis, the kinetic energy of the particle will be :

Accepted Answer

Force on particle: $F=qE_0$ (constant), so work-energy theorem gives: $$KE = W = F	imes x = qE_0x$$ (Starting from rest, all work done by the field converts to kinetic energy.) Answer: (B) $qE_0x$

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