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Q.

If Electric field directed parallel to axis is represented  by graph, and potential at origin is taken as zero. Find potential at x = 8 m

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a

-90 V

b

-100 V

c

80 V

d

-80 V

answer is A.

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Detailed Solution

∫dV=−∫x=0x=8Edx=-(area under the graph)⇒V-0 =- 10×2+1210+202+1220×4=-90⇒V=-90V
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