Potassium and iodine have formed a bond. prior to this the potassium gave up an electron. it became a

They have been bonded together so now they will form 1 ion. When 1 element gives up an electron it can now be put with another that is almost alike to it. And now since it gave up the electron, or a negative state, a positve ion is now formed. This means that The Protons have more capablity in the change, whereas potassium gave 1 electron away.

the answer for apex is the lowest

the higher the current the higher the mag field around it the higher the influence on the compass