The electric potential in a region is represented as $V = 2x + 3y -z$ ; then the expression of electric field strength is
  • A$2\hat i + 3\hat j - \hat k$
  • B$ - 2\hat i - 3\hat j + \hat k$
  • C$ - 2\hat i - 3\hat j$
  • D$2\hat i + 3\hat j$
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