A uniform field of magnitude E = 2000 N/C is directed θ=37∘ below the horizontal. Find the potential difference between P and R VP−VR (in volts).

The potential difference between two points P and R in electric field is, VP−VR=−∫RP E→⋅dl→As electric field is constant, VP−VR=−∫RP E→⋅dl→VP−VR=−E→⋅∫RP dl→=−E→⋅rP→−rR→⇒VP−VR=−E→⋅Δl→=−E⋅Δl⋅cos⁡180∘−θHere, Δl=PR=5 cm=5×10−2 mHence, VP−VR=−2000×5×10−2−cos⁡370=2000×5×10−2×45=80 V