In induction charging, there is never a transfer of electrons between the charged object (the balloon) and the object being charged (Can X). It is a simple enough experiment to be repeated at home. In human terms, it could be said that the excess electrons on the right side of the sphere not only find the balloon to be repulsive, they also find each other to be repulsive. The lines inside the rod represent negative charges. We can separate the spheres while the rod is still there. We say that a charge has been induced on the spheres. Looking at the spheres individually, it would be accurate to say that sphere A has an overall positive charge and sphere B has an overall negative charge. In diagram ii. A positively charged glass rod is brought near Can X as shown below. Then, put your finger where the electrons are. The needle does not indicate this charge because the excess of electrons is still concentrated in the top plate of the electroscope; they are attracted to the positively charged aluminum pie plate that is held above the electroscope (Diagram iv.). Induction creates a temporary and opposite charge in that other object with no contact. Electrons in sphere B are repelled by the rod and move to sphere A to create an excessive charge called also net charge. Overall, the two-sphere system is electrically neutral. One common demonstration performed in a physics classroom involves the induction charging of two metal spheres. Since metal is a good conductor, it is a good choice for this experiment. The object being charged ultimately receives a charge that is opposite that of the charged object that is used to polarize it. In the charging by induction cases discussed above, the ultimate charge on the object is never the result of electron movement from the charged object to the originally neutral objects. Then, put your finger where the electrons are. Once the balloon is removed, electrons redistribute themselves about sphere A until the excess negative charge is evenly distributed across the surface. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Which of the following occur as the glass rod approaches Can X? 6. List all that apply. The charged object does not transfer electrons to or receive electrons from the object being charged. The two spheres right now form a neutral system. The overall charge on the system of two objects is the same after the charging process as it was before the charging process. The reason that sphere A is charged now is because it has an excess of 3 electrons although this is a small charge. In the Electroscope Lab, a positively charged object such as an aluminum pie plate is used to charge an electroscope by induction. The spheres will keep their charges and this is what we mean by charging by induction. In this case, electrons would leave Can X and enter Can Y. As a result, the conductor will be charged. An electroscope is commonly used by physics teachers to demonstrate the electrostatic principles of charging and charge interactions. Suppose that a negatively charged rubber balloon is brought near a single sphere as shown below (Diagram ii). But what would happen to sphere A and sphere B if a positively charged object was used to first polarize the two-sphere system?