2. Electric Potential and Capacitance
medium

विद्युत क्षेत्र $\overrightarrow E  = {e_1}\hat i + {e_2}\hat j + {e_3}\hat k$ में आवेश $Q$ का विस्थापन $\hat r = a\hat i + b\hat j$ है। तो किया गया कार्य है

A

$Q(a{e_1} + b{e_2})$

B

$Q\sqrt {{{(a{e_1})}^2} + {{(b{e_2})}^2}} $

C

$Q({e_1} + {e_2})\sqrt {{a^2} + {b^2}} $

D

$Q(\sqrt {e_1^2 + e_2^2)} \;(a + b)$

Solution

$W = Q\,(\overrightarrow E .\Delta \overrightarrow {r\,} )$

$W = Q\,[({e_1}\hat i + {e_2}\hat j + {e_3}\hat k).(a\hat i + b\hat j)] = Q\,({e_1}a + {e_2}b)$

Standard 12
Physics

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