Practice Questions PDF
Document Details
Uploaded by ConsummateRadium
Tags
Summary
This document contains practice questions related to physics concepts such as electric fields and voltage. The questions are designed to test understanding of electromagnetism. They include calculations for magnitude, electric potential, force, and energy.
Full Transcript
1. What magnitude charge creates a 5.0 N/C electric field at a location 2.22 m away? What is the electric potential at that point? What is the force at that point? What is the electric potential energy at that point? 2. An evacuated tube uses an accelerating voltage of 40 kV to accelerate ele...
1. What magnitude charge creates a 5.0 N/C electric field at a location 2.22 m away? What is the electric potential at that point? What is the force at that point? What is the electric potential energy at that point? 2. An evacuated tube uses an accelerating voltage of 40 kV to accelerate electrons to hit a copper plate and produce X-rays. Non-relativistically, what would be the maximum speed of these electrons? 3. How far apart are two charges (A = 10 μC and B = 12 μC) if the electric potential measured at point C midway between them is 10V? 4. You decide to test an old 9.0V battery to see if it's any good. One way to do this (quickly and cheaply) is to touch your tongue to the battery terminals. When you do this, -0.18C of charge is driven through your tongue in 1.0s. What is the kinetic energy gained by the electrons during this process? What power (energy per second) is delivered to your tongue? 5. “Ink “on a kindle or smartwatch is written on a screen by having millions of microcapsules filled with negatively charged black and positively charged white pigments placed within an electrode (the top plate of the electrode is the screen). When an electric field is induced between the electrodes, the charges will distribute themselves on the top or bottom of the microcapsules, making “pixels” on the screen! a. Find the electric field strength that is required to “turn the page”- that is, move particles from the bottom to the top of the electrode. Each pigment is given a net charge of q = 16e, has a mass of m = 6.7x10 −15 kg, takes ∆t = 0.25s to make the journey, and the distance to travel is d = 40µm. (Hint: kinematic equations will help you here and we can exclude gravity’s effects as these are very small pigments)
