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Class 12 › Physics › Electric Charge and Field
CBSE2026Class Class 12 · Physics1 Marks · Mcq✅ Verified
A particle of mass $m$ and charge $q$ starts from rest and moves in an electric field $\vec{E} = E_0\hat{i}$. After travelling a distance $x$ in the field along the x-axis, the kinetic energy of the particle will be:
A. $qE_0x^2$
B. $qE_0x$
C. $q^2E_0x$
D. $q^2E_0^2x$
✅ Answer & Solution
✅ Correct Answer: B
Work done by the electric force equals the gain in kinetic energy (work-energy theorem). Force on the charge: $$F = qE_0$$ Work done over distance $x$: $$W = F \cdot x = qE_0x$$ Since the particle starts from rest, $$KE = W = qE_0x$$ Hence the correct option is (B).
