Calculate the gravitational force between the earth of mass 2.6 multiply 10 raise to power 9 and a book of 5.6multiply 10 raise to power 3 dropped on the ground , a distance of 4.2metre from the earth centre ​

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