The electric field in a region is given by
$\mathop E\limits^ \to = \left( {Ax + B} \right)\mathop i\limits^ \wedge $
, where E is in NC
–1
and x is in
metres. The values of constants are
A = 20 SI unit and B = 10 SI unit. If the potential
at x = 1 is V
1
and that at x = –5 is V
2
, then
V
1
– V
2
is :-