A glass rod is -vely charge and repel a body of -ve charge .so if a pith ball is repelled ,the charge on it must be -ve.
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When the glass rod is rubbed with a cloth, it acquires a positive charge by gaining electrons. When the charged glass rod is brought close to the pith ball, the negative charges in the pith ball are repelled, causing the pith ball to become positively charged by induction.
I'm not 100% sure because were just starting this in class today. Let's say you have a negatively charged ebonite rod and you brought it toward a neutral pithball (if you don't know what that is just picture a shere). Before you brought the rod near the pithball, the protons and electrons in the pithball are spread out evenly. When u bring the negatively charged rod towards the pithball the electrons in the pithball move to the otherside of the ball. The protons never move but are now closer to the negatively charged ebonite rod. So technically, it reacts like a positively charged object would and attrcts to the negative ebonite rod ( unlike charges attract). But once the ebonite rod is moved away from the pithball, the pithball is neutral. The pithball is always neutral because there's no transfer of electrons but I guess it is technically temporarily charged. I'm not sure if that's what your looking for but I hope it helped a bit.
When a glass rod is rubbed with wool, electrons are transferred from the wool to the glass rod, making the rod negatively charged. This transfer of electrons causes the glass rod to become statically charged, meaning it has an excess of negative charge.
A pith ball is a small, lightweight ball made of a lightweight wood called pith. It is commonly used in physics experiments to demonstrate principles of static electricity. When charged, pith balls can be used to show electrical forces and interactions.
A glass rod can be charged by rubbing it with a duster. When the duster rubs against the glass rod, electrons are transferred between the two materials, resulting in the glass rod becoming negatively charged.
When you rub a glass rod with silk, electrons are transferred from the glass rod to the silk, leaving the rod with a net positive charge. This positive charge creates an electric field around the rod, which can attract negatively charged objects or repel positively charged objects due to the principles of electrostatics.