A glass rod becomes positively charged when rubbed with silk because it loses electrons to the silk, leaving it electron-deficient.
Why does a glass rod become positively charged when it is rubbed with a silk cloth quizlet?
A glass rod gains a positive charge when rubbed with silk because electrons are stripped away from its atoms during the rubbing process.
Silk isn’t very tightly bound to its electrons, so it basically steals them from the glass rod’s surface. That leaves the glass rod with fewer electrons than protons, creating a positive charge. Meanwhile, the silk ends up with those extra electrons, becoming negatively charged. It’s a textbook example of charging by friction—two different materials swapping charges based on how badly they want electrons.
Does a glass rod become positively charged when rubbed against Cotton?
Yes, a glass rod becomes positively charged when rubbed against cotton, just as it does with silk.
The science doesn’t change with cotton. The glass rod still loses electrons to the fabric, ending up positively charged. What matters isn’t the specific material (whether it’s silk, cotton, or wool) but how badly each material wants electrons. Glass just doesn’t hold onto its electrons as tightly as most fabrics, so it usually ends up positive. This isn’t just theory—it’s a core concept in electrostatics, covered in intro physics classes everywhere.Physics Classroom.
What happens if a glass rod is rubbed against silk cloth?
When a glass rod is rubbed against silk, the glass rod loses electrons and becomes positively charged, while the silk gains those electrons and becomes negatively charged.
Silk’s got a stronger pull for electrons than glass does. The friction from rubbing increases contact between the two, letting electrons jump from the glass to the silk. You can actually see this in action—try it with a glass stirring rod and a silk scarf in a dark room. Tiny sparks will appear as the charges separate. It’s the same effect as rubbing a balloon on your hair, just on a smaller scale.
What happens between a plastic rod rubbed with a piece of animal fur and a glass rod rubbed with a piece of silk when they are brought close to each other?
They attract each other because opposite charges attract.
The plastic rod, rubbed with fur, ends up negatively charged (it grabs extra electrons), while the glass rod rubbed with silk becomes positively charged (it loses electrons). Opposite charges always pull toward each other, so the two rods will move closer when brought near. This is the same thing that makes static cling happen in a dryer—oppositely charged fabrics stick together. It’s why physics labs start with these simple demonstrations before moving on to more complicated experiments.
What is the charge on a glass rod rubbed with silk?
The charge on a glass rod rubbed with silk is positive.
This isn’t some new discovery—it’s been proven over and over in classrooms and labs. The glass rod ends up with more protons than electrons after losing electrons to the silk, giving it a net positive charge. You can test this yourself with an electroscope: bring the charged glass rod near the metal plate, and the leaves will spread apart because of the induced charge.
Why does a plastic rod become negatively charged when rubbed with a dry cloth?
A plastic rod becomes negatively charged when rubbed with a dry cloth because it gains electrons from the cloth.
Most plastics (like polyethylene or acrylic) have a stronger appetite for electrons than materials like fur, wool, or silk. When you rub a plastic rod, electrons jump from the cloth to the rod. Since plastic is an insulator, those extra electrons don’t just disappear—they stick around, giving the rod a negative charge. It’s an efficient process, which is why you can build up a noticeable charge just by rubbing a plastic spoon on your sweater.
What happens when you rub a glass rod with fur?
When a glass rod is rubbed with fur, the fur becomes positively charged and the glass rod becomes negatively charged.
This might seem backwards at first. Fur doesn’t hold onto electrons as tightly as glass, so the glass actually steals electrons from the fur. That leaves the glass rod with extra electrons (negative charge) and the fur with fewer electrons (positive charge). It’s the opposite of what happens with silk. Try it with a plastic spoon and your hair—you’ll get a completely different result than when using silk.
When a glass rod is rubbed with a piece of silk cloth the rod * 1 point?
When a glass rod is rubbed with silk, the rod quickly loses electrons and becomes positively charged.
The friction between glass and silk increases contact, making it easier for electrons to jump from the glass to the silk. Rub faster, and more electrons transfer in the same amount of time, increasing the charge’s strength. This exact principle powers Van de Graaff generators, where a moving belt transfers charge to a metal sphere, creating high voltages for experiments.
When a glass rod is rubbed with silk is brought near the gold leaf?
When a positively charged glass rod is brought near a gold leaf, the gold leaf becomes positively charged and diverges due to electrostatic repulsion.
The positively charged glass rod pushes electrons away in the gold leaf, leaving it with a positive charge. The gold leaf, now positively charged itself, repels the rod and any nearby objects with the same charge. This was a classic experiment in early electrostatics and still pops up in physics classrooms to demonstrate charge induction. The closer the rod gets, or the stronger its charge, the more the gold leaf will spread apart.
When a glass rod is rubbed with silk its mass?
When a glass rod is rubbed with silk, its mass decreases slightly because it loses electrons.
Electrons have mass—just an incredibly tiny amount. When a glass rod loses electrons during rubbing, it loses a minuscule bit of mass. For example, losing a trillion electrons only reduces the rod’s mass by about a quadrillionth of a gram. That’s way too small to measure in most labs, but it’s still a real effect. Every time you rub a glass rod, you’re technically making it a tiny bit lighter.
When a plastic rod is rubbed with fur is made to touch?
When a plastic rod rubbed with fur touches two small pith balls, the balls repel each other and are also repelled by the rod.
The plastic rod transfers some of its negative charge to the pith balls through contact. Once charged, the balls share the same negative charge, so they push away from each other. This is a classic demonstration of electrostatic repulsion. You can recreate it with polystyrene balls (modern pith ball substitutes) hanging from nylon thread. It’s a simple way to show how like charges behave and often serves as an intro to electrostatic forces.
What happens when you rub a plastic rod with wool?
When you rub a plastic rod with wool, the plastic rod gains a negative charge, and the wool becomes positively charged.
This follows the triboelectric series, which ranks materials by how easily they gain or lose electrons when rubbed. Plastic sits near the bottom of the series, meaning it loves grabbing electrons. Wool, being higher up, tends to lose them. The effect is strong enough to cause static cling or even tiny sparks in dry air. You’ve probably felt this when pulling a sweater off quickly on a dry day and getting shocked.
What will happen when the two silk pieces are brought close together?
When two silk pieces that have been rubbed against a glass rod are brought close together, they will attract one another due to opposite charging.
Each silk piece steals electrons from the glass rod, so both end up negatively charged. You’d expect them to repel, right? Not necessarily. If one silk piece was rubbed on one side of the rod and the other on the opposite side, the transfer might not be perfectly even. One piece could end up slightly more positive or negative than the other, creating an attractive force. It’s a great example of how tiny differences in charging can lead to unexpected results.
When a glass rod is rubbed against silk Which of the following statements is true?
The true statement is that the glass rod becomes positively charged and the silk becomes negatively charged.
This is a cornerstone of electrostatics, backed by experiments and theory. The glass rod loses electrons to the silk, ending up positive while the silk becomes negative. It fits perfectly with the triboelectric series, which ranks materials by their electron affinity. Glass is a strong electron donor, while silk is a strong acceptor. This principle shows up everywhere, from photocopiers to air purifiers.
What happens when an acrylic rod is rubbed with a cloth?
When an acrylic rod is rubbed with a cloth, the acrylic rod gains a positive electric charge, and the cloth gains a negative electric charge.
Acrylic behaves almost exactly like glass in electrostatic experiments—it tends to lose electrons when rubbed against most fabrics. That’s why acrylic rods are common stand-ins for glass rods in classroom demos. The friction increases contact between the rod and cloth, making it easier for electrons to transfer. The result? A positively charged acrylic rod and a negatively charged cloth, which can then pick up bits of paper or bend a stream of water—classic electrostatic party tricks.
Edited and fact-checked by the FixAnswer editorial team.
