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Q.

Assume that an electric field E→=30 x2i exists in space. Then the potential difference VA−VO, where VO is the potential at the origin and VA the potential at x = 2 m is :

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a

80 J

b

120 J

c

-120 J

d

-80 J

answer is D.

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Detailed Solution

VA−V0=∫x=0x=2 Exdx=−∫x=0x=2 30 x2 dx =−303Xx302 VA=−80 V
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