If on x -axis electric potential decreases uniformly from 60 ,V to 20 ,V between x=-2 ,m to x=+2 ,m

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2. Electric Potential and Capacitance

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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

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(AIPMT-2014)