A steel rod 2 m long and 20 mm in diameter is placed inside a copper tube of 20 mm internal diameter and 30 mm external diameter. The tube and rod are rigidly joined at their ends and the tensile force of 50 kN is applied? What is the stress in the steel and copper. Es Steel = 200 GN/M2 Ec Copper = 110 Copper 41.3 Mpa; Copper 51.8 Mpa

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine