![]() What might that mean about the net charge on the electroscope? Let's hurry onto the next step before you get ahead of me and correctly answer that: let's take the rubber rod away. Even with the negatively-charged rod next to it, we still don't see any charge down below. I take my finger away so that it is no longer grounded, and. For now, let's just go through the procedure. I will hold off on the description of the physics for a couple pictures to make it more dramatic. No charge is shown, which is understandable because the electroscope is grounded. To start, let's charge the rubber rod again and bring it close but this time my finger will stay on the electroscope to keep it grounded. Let us charge the electroscope by induction. So we have charged the electroscope by contact, but now let's try something that seems a bit more like witchcraft at first. Take away the rubber rod and the electroscope is left with a negative charge.īring back the negatively-charged rod and even more electrons get shoved down into the electroscope.Ĭharge up a glass rod with silk (giving it a positive charge) and bring it close and the surplus of electrons concentrates more heavily toward the top, neutralizing the lower part a bit.Īnd of course I can ground the electroscope simply by touching it and stealing all those excess electrons. If they are brought into contact, they will both take a net negative charge. The electroscope has a net neutral charge and the rubber rod has a net negative charge. If, now, we bring the negatively-charged rubber rod in contact with the top part of the electroscope so that charge may transfer between the electroscope and the rubber rod, this will not be the case. Note that the net charge of the electroscope is still zero. As the rubber rod is brought near, electrons are pushed down into the electroscope, negatively charging the conducting rod and foil, leaving the top part positively charged. Since protons do not move (they comprise the structure of all things), the negatively-charged electrons are the only charged particles within the electroscope that can move in response to this charged rod. When the negatively-charged rod is brought close to the electroscope, positive charges are attracted to it and negative charges are repelled away from it. How do I know this? I'm smart, that's why. The foil is moving! It's magic! The foil is moving because the foil and the conducting rod next to it are both negatively charged. We rub our rubber rod, making it negative, bring it close, and. This is a content, but boring, electroscope. There is no net charge on this electroscope. The foil is on the left side of the conducting rod. If your results seem rather weak and unimpressive, rub the rods more vigorously and for more time and it should work. The photos included on this page were taken on a hot, humid day (which usually spells death for electrostatic experiments). This is actually one of the most fail-safe electrostatics experiments I have ever seen. When the hard rubber rod is rubbed with wool, it gains electrons from the wool, gaining a negative charge. When the glass rod is rubbed with silk, the silk strips electrons from the rod, leaving it a positive charge. The equipment required for a set of experiments involving an electroscope: An electroscope can be charged using glass or rubber rods rubbed with silk or wool. Normally, they sit in contact, but if they are given a charge they will repel. The stuff in the middle comprises of the continuation of the solid conducting rod and a strip of foil. The nub sticking out the top is connected to the stuff in the middle. These are great for demonstrating basic electrostatics. Electric Whirl with Van de Graaff Generator.Electrostatics - Fur/Hair with Van de Graaff Generator.Electrostatics - Aluminum Bowls with Van de Graaff Generator.Induction - Changing Magnetic Field in a Coil.Electric Potential - Lightning Plate with Van de Graaff Generator.Reflection and Refraction - Light Box and Optical Set.Pressure - Differential Pressure Bottle.Collisions - Energy Transformation Balls.Chaotic Pendulum - Variable Speed Motor.Simple Harmonic Motion - Spring vs Pendulum.Angular Momentum - Turntable and Dumbbells.Independence of Coordinates - Ballistic Cart.Momentum - Inelastic Collisions - Modified Newton's Cradle.Independence of Coordinates - Vertical Acceleration.Independence of Coordinates - Hinged Stick & Falling Ball.Momentum - Elastic Collisions - Newton's Cradle.Independence of Coordinates - Shoot the Monkey.
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