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