<Dd> F → = ∇ φ (\ displaystyle (\ vec (F)) = \ nabla \ phi) </Dd> <P> The work done is then simply the difference in the value of this potential in the starting and end points of the path . If these points are given by x = a and x = b, respectively: </P> <Dl> <Dd> W = φ (b) − φ (a) (\ displaystyle W = \ phi (b) - \ phi (a)) </Dd> </Dl> <Dd> W = φ (b) − φ (a) (\ displaystyle W = \ phi (b) - \ phi (a)) </Dd>

What type of forces act through field of influence