what type of forces act through field of influence
Force field (physics)
∮ C ⁡ F → ⋅ d r → = 0 ( \ displaystyle \ oint _ ( C ) ( \ vec ( F ) ) \ cdot d ( \ vec ( r ) ) = 0 )
∮ C ⁡ F → ⋅ d r → = 0 ( \ displaystyle \ oint _ ( C ) ( \ vec ( F ) ) \ cdot d ( \ vec ( r ) ) = 0 )