A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is:
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A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is:

G1 Physics · Accepted Answer

Step 1: Electric force is constant: F = qE. Step 2: Work done over displacement y along force is W = Fy = qEy. Step 3: From work-energy theorem ΔK = W; starting from rest gives K = qEy.