Question

A uniform electric field to 100 `Vm^(-1)` is directed at `60^@` with the positive x-axis as shown in figure. If OA= 2 m, the potential difference `V_O - V_(A)` is

A. `-50V`
B. `50V`
C. `100 V`
D. `-100V`

Answer 1

Correct Answer - D

`OB=OAcos60^(@)=2xx(1)/(2)=1m`
`V_(B)-V_(O)=E(OB)=100xx1=100V`
`V_(A)-V_(O)=100V[becauseV_(B)=V_(A)]`
`V_(O)-V_(A)=-100V`