If on the $x$-axis electric potential decreases uniformly from $60 \,V$ to $20 \,V$ between $x=-2 \,m$ to $x=+2 \,m$, then the magnitude of electric field at the origin
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(b)
$E_x=\frac{40}{4}=10 \frac{ V }{ m }$
$E_y \neq 0$
$E=\sqrt{E_x^2+E_y^2} > 10$
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