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Let  $\nabla .(fv)=x^2y+y^2z+z^2x$ , where $f$ and $v$ are scalar and vector fields respectively. If $v=yi+zj+xk$ then $v.\Delta f$ is

  1. $x^2y+y^2z+z^2x$
  2. $2xy+2yz+2zx$
  3. $x+y+z$
  4. $0$
in Electromagnetic Fields by (9.3k points)
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