![]() ![]() So the question we could ask is, how far in is this electron going to go before it gets bounced out? Let's convince ourselves that it's going to get bounced out. And it is moving with initial velocity, V0 towards a region of uniform field, okay? Out here, there's no uniform field, okay? It's field-free, it's just coasting along, and then it's going to enter a region of uniform field that looks just like that. So let's just do an example problem just to get an idea. It's always pushing the charge in one direction. That's basically what you have with the uniform field. ![]() When, say, you're throwing a ball and you have gravity always pulling it down at some acceleration. You can do your x-axis kinematics, you can do your y-axis kinematics, and you can combine them and solve them, okay? So uniform field is an interesting case because it's just like a gravitational field when you're near the surface of the Earth. ![]() And it's still true that you can apply it in both directions. It's still true that the sum of the forces equals ma. So it feels that, but it also obeys kinematics still. As soon as it enters, it will start to feeling the force, F equals qE. So if you have a particle moving around outside the electric field, it didn't feel anything. F equals qE, that's how we defined, The electric field. When we're doing these problems, we often just say there is a uniform field, okay? So what is that going to do to a charged particle? So a charged, So what does the charged particle feel? Well, by definition, it feels a force that's just proportional to the electric field. We don't worry about how they were created, right? That's somebody else's problem. And what we're saying there is that in some region of space, we have a uniform field, but outside the region, we don't, okay? So we play around a lot with uniform fields. So I might say, uniform field exists on the positive x-axis or something like that. But then, another thing we'll do in these problems, is that we'll have a uniform field but only in a certain region. Okay, let's go back and finish the problem. So if you're a charged particle in this uniform electric field, you're always going to feel a force along the field vectors. No matter where you go in a 3D space, the field vectors all point together. And if I sort of spin it around and we turn it, we look in different way, every field vector is now pointing down, every field vector is pointing up. So here is a 3D view of the uniform field and everywhere you go, the electric field is pointing up into the right. Uniform field is really important, so let's make sure you get it. It's just electric field vectors, they're always the same magnitude, they're always pointing to the right? Let's look at it in the visualization lab. So if I say, I have a uniform field pointing to the right, I might draw it like that, okay? That really means it's not just in the plane of the board, everywhere you go. It's the same magnitude., it's the same direction, Etc. So what that really means is everywhere you go in space, the electric field vectors look the same. So let's make sure we all agree on what a uniform, Field means, okay? So I'll often say, we have a uniform e-field. It's interesting and we like to write problems about So one thing about this is often we'll start with a uniform field. So let's do a charged particle, Forces and motion. Now, that we have electric fields and how they create forces on particles, we can start to mix it with kinematics. It will thoroughly prepare learners for their upcoming introductory physics courses, or more advanced courses in physics. Uniform electric field series#This comprehensive course series is similar in detail and rigor to what is taught on-campus. Once the modules are completed, the course ends with an exam. ![]() Uniform electric field free#Each module contains reading links to a free textbook, complete video lectures, conceptual quizzes, and a set of homework problems. The course follows the typical progression of topics of a first-semester university physics course: charges, electric forces, electric fields potential, magnetic fields, currents, magnetic moments, electromagnetic induction, and circuits. They will gain experience in solving physics problems with tools such as graphical analysis, algebra, vector analysis, and calculus. Upon completion, learners will have an understanding of how the forces between electric charges are described by fields, and how these fields are related to electrical circuits. This course serves as an introduction to the physics of electricity and magnetism. ![]()
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