The pictures show a rod made of glass, a swatch of plastic wrap, and an insulated ball of gold, all initially uncharged. The rod is dragged across the plastic wrap in order to transfer some charge. Label the signs of the electric charge on the glass and the plastic wrap. Once the rod is charged, it is placed near the gold ball without making contact. Label the rod and the near and far sides of the gold ball with the signs of their electric charges. Answer Bank ++++ no charge Rod Rod ...... Near side Swatch Metal ball Far side ..........
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- A 5 g dust particle has a charge of 7 ?C and is suspended between two oppositely charged parallel plates as shown below. The distance between the particle & the edges of the plates is much greater than the distance between the plates. Each plate has the same constant uniform charge density. (note: Top plate is negative and bottom is positive) Find the voltage between the plates. V=Two small balls with a mass of 2 g each are hanging on two separate strings 0.25 m (25 cm) long attached to a common point. They are given an identical negative charge and spread apart to a distance 3 cm from each other. Determine the charge on each ball by finding the forces in equilibrium and using Coulomb's law. How many electrons are there on each ball? What will happen in an identical situation if the mass of the balls is cut in half? What would happen if the charge on each ball is doubled?The gecko in the photo is sticking upside down to a smooth ceiling. The remarkable adhesion might be due to static electricity. Gecko feet are covered with microscopic hairs. When these hairs rub against a surface, charges separate, with the hair developing a positive charge and negative charge forming below the surface. There is an attractive force between the separated charges. This is an effective means of adhering to a surface, but it comes at a cost: Two planes of charge are like two charged plates of a capacitor, which takes energy to charge. Doubling the amount of charge on each surface increases the attractive force, but also increases the energy required to separate the charge. By what factor does this energy increase?
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- A small plastic ball with a mass of 6.65 10-3 kg and with a charge of +0.149 µC is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0° with respect to the vertical. The area of each plate is 0.0138 m2. What is the magnitude of the charge on each plate? CIn the diagram below, A, B, and C are conducting spheres that are fixed in place and can be considered to be point charges. The spheres are fixed in place and each have a mass of 3.0 grams. Sphere A has a charge of +12µC, Sphere B has a charge of –9.0µC, and Sphere C has a charge of –6.0µC. Spheres A and B are separated by a distance of 0.020 m and Spheres B and C are separated by a distance of 0.010 m. 0.020 m 0.010 m A B C +12 μC -9 μC -6 μC What is the magnitude of the net force (in Newtons) acting on Sphere B? Write your answer as a number only. Do not include units in your answer.Object A is an insulator. Object B is a conductor. Object A is neutral. Object B has a positive charge. Object B is touched to the ground. When the ground is pulled away, what charge do the two objects have? KEY Conductor A +B+ Insulator Tap to toggle through possible options for Type of Charge: Type of Charge on A: Tap here. Type of Charge on B: Tap here.