2. Electric Potential and Capacitance
medium

मान लें व्योम में एक विध्युत क्षेत्र $\vec{E}=30 x^{2} \hat{i}$ है। तब विभवान्तर $V_{A}-V_{O}$ जहाँ $V_{O}$ मूलबिन्दु पर विभव एवं $V_{A}, x=2 \,m$ पर विभव ....$V$ है।

A

$-120$ 

B

$-80$

C

$80$

D

$120$

(JEE MAIN-2014)

Solution

Potential difference between any two points in an electric field is given by,

${\mathrm{d} \mathrm{V}=-\vec{E} \cdot \overrightarrow{d x}}$

${\int_{V_{O}}^{V_{A}} d V=-\int_{0}^{2} 30 x^{2} d x}$

${V_{A}-V_{O}=-\left[10 x^{3}\right]_{0}^{2}=-80\, \mathrm{J} / \mathrm{C}}$

Standard 12
Physics

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