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MDCAT Physics QUESTION #4405
Question 1
If the surface charge density of an infinite sheet increases by $25\%$, the electric field intensity:
  • Increases by $25\%$✔️
  • Increases by $50\%$
  • Decreases by $25\%$
  • Remains the same
Correct Answer Explanation
Electric field due to an infinite sheet: $E = \dfrac{\sigma}{2\varepsilon_0}$. Since $E \propto \sigma$ (direct proportion), if $\sigma$ increases by $25\%$, then $E$ also increases by $25\%$.