yes it is easily controlled.
The earth is an electromagnet. It has a north pole and a south pole. Apex: A magnet always has two poles, earth is a elecrtomagnet
An Electromagnet. Take a screwdriver, and a put 50 turns of wire round the screwdriver. Now connect one wire to positive and one wire to negative of a battery and try to pick up some paperclips.
A magnetic field is induced by pushing current though a wire; so you could consider a straight wire an electromagnet. Using more coils will strenghten the electromagnet, though, so a straight wire version will be very weak comparitively.
F=N*I so directly proportional
You would not get a true reading any longer. The forces of the electromagnet are greater than the natural magnetism of the Earth.
It is true that physical strength tends to decline in old age.
Almost: an oligarchy is a type of government controlled by a small group of very wealthy individuals who control the political process. Control of a government by military means is called a military dictatorship, while control of a government due to social position is now obsolete (think of the French nobles in the late1700's).
strength = molar mass = number of electrons