3. Consider the two situations shown below. a. In each case explain what must be happening for an induced field to be present. b. Explain how the combination of these two situations creates a self-perpetuating electromagnetic wave а. b. Induced Ē Induced B

3. Consider the two situations shown below. a. In each case explain what must be happening for an induced field to be present. b. Explain how the combination of these two situations creates a self-perpetuating electromagnetic wave а. b. Induced Ē Induced B

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 107CP: A particle of cosmic dust has a density =2.0g/cm3 , (a) Assuming the dust particles are spherical...

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A particle of cosmic dust has a density =2.0g/cm3 , (a) Assuming the dust particles are spherical and light absorbing, and are at the same distance as Earth from the Sun, determine the particle size for which radiation pressure from sunlight is equal to the Sun's force of gravity on the dust particle, (b) Explain how the forces compare if the particle radius is smaller, (c) Explain what this implies about the sizes of dust particle likely to be present in the inner solar system compared with outside the Oort cloud.
2. A square conducting frame sits in a region which has a magnetic field directed as shown. The magnetic field is uniform in space but changes with time: mT t³ + 100 mT S3 B(t) = 200- for t > 0. We will go through the steps needed to use Lenz's law to determine the direction of the current induced in the square frame. a. What is the direction of the external magnetic field through the loop? b. Is the magnitude of the magnetic flux through the loop increasing, decreasing or unchanged? C. The induced magnetic field must resist the CHANGE in flux that produced it. What is the direction of the induced magnetic field through the loop? d. What is the direction (cw/ccw) of the induced current required to generate the induced magnetic field given in (c)? This is the same direction as the induced EMF.
To use Lenz’s law to determine the directions of the induced magnetic fields, currents, and emfs:1. Make a sketch of the situation for use in visualizing and recording directions.2. Determine the direction of the magnetic field B.3. Determine whether the flux is increasing or decreasing.4. Now determine the direction of the induced magnetic field B. It opposes the change in flux by adding or subtracting from the original field.5. Use RHR-2 to determine the direction of the induced current I that is responsible for the induced magnetic field B.6. The direction (or polarity) of the induced emf will now drive a current in this direction and can be represented as current emerging from the positive terminal of the emf and returning to its negative terminal.
Which of the following statements are TRUE regarding induced electric fields? I. In any closed path, the work done by an induced electric field in moving a charge is zero. II. An electric potential can be derived from induced electric field. III. Induced electric field is produced only when magnetic flux is varying in time. O A. I only OB. II only OC. Ill only OD. All of the above
2. A square conducting frame sits in a region which has a magnetic field directed as shown. The magnetic field is uniform in space but changes with time: mT B (t) = 200² t³ + 100 mT for t > 0. We will go through the steps needed to use Lenz's law to determine the direction of the current induced in the square frame. a. What is the direction of the external magnetic field through the loop? Is the magnitude of the magnetic flux through the loop increasing, decreasing or unchanged? c. The induced magnetic field must resist the CHANGE in flux that produced it. What is the direction of the induced magnetic field through the loop? d. What is the direction (cw/ccw) of the induced current required to generate the induced magnetic field given in (c)? This is the same direction as the induced EMF.
Title a. Explain the basic operating principle of an electromagnetic control relay. b. Explain the terms.. Description a. Explain the basic operating principle of an electromagnetic control relay. b. Explain the terms normally open con tad and normally closed contact as they apply to this relay.
Part A You've recently read about a chemical laser that generates a 20.0-cm-diameter, 24.0 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small What speed would such a block have if pushed horizontally 95.0 m along a frictionless track by such a laser? payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20.0-cm-diameter, 98.0 kg, perfectly absorbing block. Express your answer with the appropriate units. HÀ 39.38 S Submit Previous Answers Request Answer X Incorrect: Try Again: 5 attempts remaining
A square frame with side length a is placed parallel to the magnetic field B. The magnetic field is increasing at a constant rate vg. What induced current is flowing in the frame? В a Select one: O a.I= vga², clockwise O b.I= 0A O .I= vga?, anti-clockwise O d.I= Buga, anti-clockwise O e.I = Buga, clockwise Check Which of Maxwell's equations would change if there were magnetic monopoles? (material from the workshop 3) Select one or more: O a. Faraday's Law O b. Gauss' Law for magnetic field O C. Ampere-Maxwell's Law O d. none of the equations would change O e. Gauss' Law Check In which of the following setups does the Ampere's Law fail? (material from the workshop 3) Select one: O a. calculating B from a U shaped wire O b. calculating B from a straight wire O c.calculating B inside the charged capacitor O d. calculating B from a solenoid O e. when there is a changing electric field
Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2.10-mm-diameter superconducting wire. Part A You may want to review (Pages 810 - 814) What current is needed? Express your answer with the appropriate units. HÁ Value Units Submit Request Answer
2. The current goes around a rectangular conducting frame as shown. The frame sits in the external magnetic field 5. a. Use = x to determine the direction (+x/-x/+y/-y/+z/-z/zero) of the torque on the rectangular loop. b. We can also determine the torque by analyzing the force that the external magnetic field exerts on the different segments of the square frame. Give the direction (+x/-x/+y/-y/+z/z/zero) of the magnetic force on each section of the frame: I. Force on the top leg of the current loop. II. III. IV. V. Force on the right leg of the current loop. Force on the bottom leg of the current loop. Force on the left leg of the current loop. +z 1 +y B +8 Use your analysis of the forces to determine the direction of the torque on the frame. Check that this is consistent with your answer to (a).
108. A beam of singly ionized helium is injected into the velocity selector at right. The electric field is 25 kN/C directed up. Note: c = 3 x 108 m/s a. What magnitude and direction magnetic field is necessary to select ionized helium at 0.05c? Mathematical Analysis b. Would this selector also work with doubly ionized helium at 0.05c? c. If the beam is replaced with a beam of neutral helium, what happens to neutral helium atoms traveling at 0.05c?
1. You've recently read about a chemical laser that generates a 20-cm-diameter, 25 MW laser beam. One day, after physics class, you start to wonder if you could use the radiation pressure from this laser beam to launch small payloads into orbit. To see if this might be feasible, you do a quick calculation of the acceleration of a 20-cm-diameter, 100 kg, perfectly absorbing block. What speed would such a block have if pushed horizontally 100 m along a frictionless track by such a laser?