Only two types of charge! Positive Charge(protons – therefore innuclei of atoms ) Negative Charge(electrons – thereforeorbiting atoms – andcan be ‘brushed off’onto other atomsmaking ions
Only electrons move… Positive ChargedObject – too fewelectrons Negative ChargedObject – too manyelectrons Net charge is ALWAYSdue to ELECTRONtransfer – protonsmoving about wouldchange the elementsyou are dealing with.
It all depends on gravity… Whether you can see acharged object ‘react’ toanother one depends onweight. Two forces are inoperation – electric forceand gravitational force. If the electric force isbigger the object can beseen defy gravity… or inthe case of the object onthe left inertia andfriction !
Charging by Friction Some objects are more attractiveto electrons than others. If yourub a balloon (very attractive toother atoms’ electrons) togetherwith a woollen jumper. It will‘steal’ some of the electrons andleave the jumper postive. The balloon will have becomepositively charged by friction.
Charging by Induction If the balloon is brought near to aneutral object the charged regionaround it (its electric field) will affect theelectrons in the neutral object. It willmake them move away from it – givingthe surface of the neutral object near tothe balloon a positive charge. The balloon will then be attracted to itand will stick to it.