A micro-tesla is 10-6 T, and Earth's magnetic field is about 50 micro-teslas. Suppose you have a long wire carrying 10 A of current and you bring up your compass to see if it can be made to deflect by the wire. As you bring it close, at what distance from the wire might you expect to see the compass move if it is sensitive to 20% of Earth's field

scientific laws are the result of testing theories and proving them to be facts.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force