Oil in a hydraulic cylinder is compressed from an initial volume of 2 m3 to 1.96 m3. If the pressure of oil in the cylinder changes from 40 MPa to 80 MPa during compression, the bulk modulus of elasticity of oil is
1
1000 MPa
2
1500 MPa
3
8000 MPa
4
4000 MPa
5
2000 MPa