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2. Electric Potential and Capacitance
medium
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
A
Must be $10 \,V / m$
B
May be greater than $10 \,V / m$
C
Is zero
D
Is $5 \,V / m$
Solution

(b)
$E_x=\frac{40}{4}=10 \frac{ V }{ m }$
$E_y \neq 0$
$E=\sqrt{E_x^2+E_y^2} > 10$
Standard 12
Physics