AMU Engineering 2017 solved paper Solved Paper

As we know, the relation between electric field and potential difference is given as,

VA

∫

VO

dV=−

r

∫

0

E.dr
⇒VA−V0=−

2m

∫

0

30x2dx =−30[

x3

3

]02
⇒VA−VO=−30×[

23

3

−

0

3

] =−30×

8

3

=−80V
Note Potential is a scalar quantity. So, it cannot be written as −80

^

j

as given in option.