You can start testing your knowledge with these quizzes. You'll see that they're in ascending order of difficulty. There will also be plenty of exercises during BootCamp in addition to these Quizzes. You can get started by clicking on the "Start Quiz" button at the bottom left of the page.
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You'll be able to answer question by question in this Quiz. You'll also have access to the video solution for each question in the Quiz, but we advise you to watch the solution only after you've thoroughly researched the answer!
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An infinite wire of linear density λ = 5 μC/m is placed vertically 10 cm from a point charge of Q = -2 μC. What is the electric field halfway between these two objects?
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Question 2 of 6
2. Question
Three infinite plates are arranged vertically at the same distance from each other. Their surface charge densities are, from left to right: -σ, -2σ then 3σ. What is the value of the electric field in the region to the right of the third plate?
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Index
Be sure to consider all 3 plates!
Question 3 of 6
3. Question
A coaxial cable (similar to the one seen at BootCamp) carries a charge of linear density 5 nC/m on its inner cylinder of radius a = 3 cm and -9 nC on its outer cylinder of radius b = 5 cm. What is the modulus of the resulting electric field at 4 cm from the center, then at 8 cm from the center?
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Index
When you calculate the field outside the cable, you have to add up the charges of the two cylinders.
Question 4 of 6
4. Question
Consider a cube with sides 40 cm long, placed so that its sides are parallel to the axes of the coordinate system and its center coincides with the origin of the reference frame. At its center is a point charge of 5 nC, and outside is an electric field of (-300 j) N/C. How strong is the electric flux across its upper surface?
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Index
When you look at just one side of the cube, the value of the field caused by the particle inside is 1/6 of the total charge it causes. You can find this total charge using Gauss.
Question 5 of 6
5. Question
A charge is uniformly distributed in an infinitely long non-conducting cylinder of radius 20 cm. The charge density is ρ = 10 nC/m^3. What is the electric field at 10 cm from the center?
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Question 6 of 6
6. Question
A non-conducting sphere with a radius of 20 cm carries a uniformly distributed charge. At 10 cm from the center of the sphere, the electric field is 2000 N/C outwards. What is the electric field at 30 cm from the center?
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Index
First, we have to look for Qtot of the sphere, so we have to look for ρ first.
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