AP EAMCET Engineering 23 Sep 2020 Shift 1 Paper

Given figure,As we know, VA−VB=−

B

∫

A

E⋅dr
Here, E is constant. So, we may write above expression as
VA−VB=−E⋅r
VA−VB=−Er‌cos‌θ
where, r is distance between points A and B,
θ is angle between E and displacement vector r from point A to point B.
∴‌‌VA−VB=−10×2×cos‌60∘
(θ=60∘ from figure)
=−10×2×‌

1

2

=−10V