A uniform electric field of $20\, N/C$ exists along the $x$ -axis in a space. The potential  difference $(V_B -V_A)$ for the point $A(4\,m, 2\,m)$ and $B(6\,m, 5\,m)$ is.....$V$
  • A$20 \sqrt {13}$
  • B$-40$
  • C$+ 40$
  • D$-20 \sqrt {13}$
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