It is known Magnetic fields are set due to moving electric charges. Since electric and gravitational fields are proportional to 1/r^2 where r is the distance from the charge and body respectively. Also both these fields obey Gauss law. So they are identical in certain aspects I was sitting in my balcony drinking a cup of tea and suddenly a thought came to my mind. Is there a new field set up due to moving masses, the same way magnetic field is set up due to moving charges? For example when an electric current(I=dq/dt) passes through a wire, magnetic field is set up in concentric circles. now the same analogy can be extended to this situation. let us take a tube and let water flow through it. let the rate of flow of mass be constant, the same way the rate of flow of charge is constant in given wire ie.. dm/dt is constant.Now by analogy, will a new field be set up in concentric circles around the tube the same way magnetic field is set up around the wire ?