86.4 The gravitational field and Gauss's law for the the gravitational field @The gravitational field is strong where field lines are close together and weak where they are far apart. The number of lines passing through a square meter oriented perpendicular to the lines is proportional to the magnitude of the gravitational field. 3 Field lines are never cross The field at any point has a unique direction $16.5 Gauss's law for electric field and its applications 4. Gauss'law for the the gravitational field ① the flux of a vector Air flow Uniform vector field Φ=(vc0s6)S=p·S17 2The gravitational field is strong where field lines are close together and weak where they are far apart. The number of lines passing through a square meter oriented perpendicular to the lines is proportional to the magnitude of the gravitational field. 3Field lines are never cross. The field at any point has a unique direction. §6.4 The gravitational field and Gauss’s law for the the gravitational field v S v S r r Φ = ( cosθ ) = ⋅ §16.5 Gauss’s law for electric field and its applications S r Uniform vector field 4. Gauss’ law for the the gravitational field 1the flux of a vector