A student is investigating what happens when a neutral metal sphere sitting on an insulated stand is touched by a negatively charged rod. The set up for the student's investigation is shown in the diagram.
image 3845826dd9f243109fa16213cd34e0d4
What will happen to the excess electrons when the negatively charged rod touches the metal sphere?
a
The excess electrons will move from the rod to the sphere and spread out on the sphere.
b
The excess electrons will move from the sphere to the rod and spread out along the rod.
c
The excess electrons will move from the rod to the sphere and stay clustered in the area where the rod touches the sphere.
d
The excess electrons will move from the sphere to the rod and stay clustered near the end of the rod that touches the sphere.
a. The excess electrons will move from the rod to the sphere and spread out on the sphere. This is because electrons always move from a region of high concentration (the negatively charged rod) to a region of low concentration (the neutral metal sphere). Once the excess electrons reach the sphere, they will distribute evenly across its surface.
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A student is designing an investigation of the distribution of charges in conductors she will use to conducting spheres, mounted on insulating stands in the investigation, the conducting spheres, are shown
I'm sorry, I cannot see the conducting spheres you are referring to as I am an AI language model and don't have access to any images or diagrams. However, if you have a question or need further assistance with your investigation, I would be happy to help you.
What should the student do in her investigation to produce these results
Without knowing the specific nature of the investigation, here are some general steps the student can follow:
1. First, ensure that all the equipment is set up correctly and safely. The conductive spheres should be mounted on insulating stands and any electrical sources used should be properly grounded.
2. Next, the student can charge one of the spheres by bringing a charged object in close proximity. For example, a negatively charged rod can be brought near the sphere to induce a negative charge on its surface.
3. After charging the first sphere, the student should then use a grounded metallic object (such as a wire) to touch the surface of the charged sphere. This will allow the excess charge to flow through the wire and onto the ground, leaving the sphere neutral.
4. The student can then measure the electric potential at different points on the surface of the sphere using an electrostatic voltmeter. This will allow them to determine the distribution of charge on the sphere's surface.
5. The student can also repeat this process with the second sphere to compare the differences in charge distribution between the two spheres.
6. Finally, the student should record their observations and repeat the experiment multiple times to ensure the results are consistent. They can also vary the conditions of the experiment (such as the amount or type of charge used to charge the spheres) to explore different aspects of charge distribution in conductors.
To determine what will happen to the excess electrons when the negatively charged rod touches the metal sphere, we need to understand the basic principles of charge transfer.
When two objects come into contact, electrons can move from one object to another. This happens because electrons have a negative charge and are attracted to objects with a positive charge and repelled by objects with a negative charge.
In this scenario, the negatively charged rod has an excess of electrons, while the metal sphere is neutral, meaning it has an equal number of protons (positive charge) and electrons (negative charge). When the rod touches the sphere, electrons will transfer between them until equilibrium is reached.
Since the metal sphere is neutral and has no excess electrons, the excess electrons from the rod will move from the rod to the sphere. These excess electrons will then spread out on the sphere, evenly distributed across its surface.
Therefore, the correct answer is option "a": The excess electrons will move from the rod to the sphere and spread out on the sphere.