Why does a polythene rod become negatively charged when rubbed with a dry cloth?
When a polythene rod is rubbed with a duster, the friction causes electrons to gain energy. Electrons gain enough energy to leave the atom and ‘rub off’ onto the polythene rod. The polythene rod has gained electrons, giving it a negative charge.
Why the rod and the cloth each get the same amount of charge?
This force of attraction is the same force that holds the electrons close to the nucleus in an atom. Electrons have been rubbed from the Perspex onto the cloth. Again, the rod and the cloth have opposite charges and will attract each other.
Why does an insulator become negatively charged when rubbed with a dry cloth?
When insulating materials rub against each other, they may become electrically charged . Electrons , which are negatively charged, may be ‘rubbed off’ one material and on to the other. The material that gains electrons becomes negatively charged. The material that loses electrons is left with a positive charge.
How does a plastic rod gain charge when rubbed?
For example, when a plastic rod is rubbed with a duster, electrons are transferred from one material to the other. The material that gains electrons becomes negatively charged. The duster picks up electrons from the rod. This leaves the rod with a positive overall charge and the duster with a negative overall charge.
What objects are attracted to a plastic rod rubbed with wool?
Plastic rods rubbed with wool repel each other. Glass rod rubbed with silk attracts plastic rod rubbed with wool.
What will happen when you touch the top of the bolt with charged plastic rod and why?
If the positively charged rob is actually touched to the knob, the rob will remove some electrons and then when the rob is removed, the electroscope will remain positively charged. This is a permanent positive charge. Charging an object by touching it with another charged object is called charging by conduction.