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Figure shows a set of equipotential surfaces. The magnitude and direction of electric field that exists in the region is .........
  • A$10 \sqrt{2} \,V / m$ at $45^{\circ}$ with $x$-axis
  • B$10 \sqrt{2} \,V / m$ at $-45^{\circ}$ with $x$-axis
  • C$5 \sqrt{2} \,V / m$ at $45^{\circ}$ with $x$-axis
  • D$5 \sqrt{2} \,V / m$ at $-45^{\circ}$ with $x$-axis
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