A uniform electric field of 20 N/C exists in the vertically downward direction. Find the increase in the electric potential as one goes up through a height of 40 cm.

Options

A. 8 VOLTS
B. -8 VOLTS
C. 0 VOLTS
D. NONE OF THESE

Answer

A

Explanation

`E=-(dv)/(dr) implies dv=-vec(E). Vec(dr)`
for `vec(E)=` constant `implies" "DeltaV=- vec(E). Vec(Delta r)`
`DeltaV=-20 (-hat(j)). (40xx10^(-2)) hat(j)=8` volts.