The electric potential $V$ as a function of distance $x$ (in metre) is given by $V=(5x^2+10x-9)$. The value of electric field at $x=1\,\text{m}$ would be:
- A$-20\,\text{volt/m}$
- B$6\,\text{volt/m}$
- C$11\,\text{volt/m}$
- D$-23\,\text{volt/m}$
✓ Correct answer: A
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