(a) Explanation The flux through the loop decreases with time when the loop falls out of the magnetic field. Then an emf is induced in the loop. Write the expression for induced current. I = ε R (I) Here, I is the current, R is the resistance, and ε is the induced emf. Write the expression for magnitude of induced emf. ε = d Φ d t (II) Here, Φ is the magnetic flux. Write the expression for resistance of the wire. R = ρ l A (III) Here, A is the area of the wire, l is the length of the loop, and ρ is the resistivity. Write the expression for area with diameter d . A = π d 2 4 (IV) Here, d is the diameter of the loop. Use equation (IV) in (III), and substitute 4 l for l . R = ρ 4 l π d 2 4 (V) Use equation (II) and (V) in (I). I = ( π d 2 4 ρ 4 l ) d Φ B d t (VI) Write the expression for magnetic flux. Φ B = B A cos θ (VII) Here, θ is the angle between the area vector and field vector (b) To determine The terminal velocity of the loop before its upper horizontal side exits the field. (c) To determine The terminal velocity of the loop when the loop is made up of copper and B = 0.80 T .

Physics for Science and Engineering With Modern Physics, VI - Student Study Guide

4th Edition

ISBN: 9780132273244

Author: Doug Giancoli

Publisher: PEARSON

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Magnetic Force

A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.

Question

Chapter 29, Problem 79GP

(a)

To determine

The magnetic drag force that acts on the wire loop.

(b)

To determine

The terminal velocity of the loop before its upper horizontal side exits the field.

(c)

To determine

The terminal velocity of the loop when the loop is made up of copper and B=0.80 T.

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Chapter 29, Problem 78GP

Chapter 29, Problem 80GP

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Chapter 29 Solutions

Physics for Science and Engineering With Modern Physics, VI - Student Study Guide

Ch. 29.1 - Return to the Chapter-Opening Question, page 758,...Ch. 29.2 - Prob. 1BE Ch. 29.3 - In what direction will the electrons now in Fig....Ch. 29.5 - A bicycle headlight is powered by a generator that...Ch. 29.7 - Prob. 1EE Ch. 29 - Prob. 1Q Ch. 29 - What is the difference between magnetic flux and...Ch. 29 - Suppose you are holding a circular ring of wire...Ch. 29 - Prob. 4Q Ch. 29 - Is there a force between the two loops discussed...

Ch. 29 - Suppose you are looking along a line through the...Ch. 29 - The battery mentioned in Question 6 is...Ch. 29 - Prob. 8Q Ch. 29 - Prob. 9Q Ch. 29 - In situations where a small signal must travel...Ch. 29 - What is the advantage of placing the two insulated...Ch. 29 - Prob. 12Q Ch. 29 - A region where no magnetic field is desired is...Ch. 29 - A cell phone charger contains a transformer. Why...Ch. 29 - An enclosed transformer has four wire leads coming...Ch. 29 - The use of higher-voltage lines in homessay, 600 V...Ch. 29 - Prob. 17Q Ch. 29 - Prob. 18Q Ch. 29 - Prob. 19Q Ch. 29 - Will an eddy current brake (Fig. 2921) work on a...Ch. 29 - It has been proposed that eddy currents be used to...Ch. 29 - The pivoted metal bar with slots in Fig. 2935...Ch. 29 - If an aluminum sheet is held between the poles of...Ch. 29 - A bar magnet falling inside a vertical metal tube...Ch. 29 - A metal bar, pivoted at one end, oscillates freely...Ch. 29 - Since a magnetic microphone is basically like a...Ch. 29 - Prob. 1P Ch. 29 - (I) The north pole of the magnet in Fig. 2936 is...Ch. 29 - Prob. 3P Ch. 29 - (I) A 22.0-cm-diameter loop of wire is initially...Ch. 29 - Prob. 5P Ch. 29 - (II) A 10.8-cm-diameter wire coil is initially...Ch. 29 - (II) A 16-cm-diameter circular loop of wire is...Ch. 29 - (II) (a) If the resistance of the resistor in Fig....Ch. 29 - Prob. 9P Ch. 29 - (II) The magnetic field perpendicular to a...Ch. 29 - (II) A circular loop in the plane of the paper...Ch. 29 - (II) Part of a single rectangular loop of wire...Ch. 29 - (II) While demonstrating Faradays law to her...Ch. 29 - Prob. 14P Ch. 29 - (II) A 22.0-cm-diameter coil consists of 28 turns...Ch. 29 - (II) A power line carrying a sinusoidally varying...Ch. 29 - (II) The magnetic field perpendicular to a single...Ch. 29 - Prob. 18P Ch. 29 - (II) A 25-cm-diameter circular loop of wire has a...Ch. 29 - (II) The area of an elastic circular loop...Ch. 29 - Prob. 21P Ch. 29 - Prob. 22P Ch. 29 - Prob. 23P Ch. 29 - (II) Inductive battery chargers, which allow...Ch. 29 - Prob. 25P Ch. 29 - Prob. 26P Ch. 29 - (I) The moving rod in Fig. 2912b is 13.2 cm long...Ch. 29 - (I) The moving rod in Fig. 2912b is 12.0 cm long...Ch. 29 - Prob. 29P Ch. 29 - (II) If the U-shaped conductor in Fig. 2912a has...Ch. 29 - (II) Suppose that the U-shaped conductor and...Ch. 29 - (II) When a car drives through the Earths magnetic...Ch. 29 - Prob. 33P Ch. 29 - Prob. 34P Ch. 29 - (III) A short section of wire, of length a, is...Ch. 29 - (I) The generator of a car idling at 875-rpm...Ch. 29 - Prob. 37P Ch. 29 - (II) A simple generator has a 480-loop square coil...Ch. 29 - (II) Show that the rms output of an ac generator...Ch. 29 - (II) A 250-loop circular armature coil with a...Ch. 29 - Prob. 41P Ch. 29 - (I) A motor has an armature resistance of 3.05 ....Ch. 29 - (II) What will be the current in the motor of...Ch. 29 - (II) The back emf in a motor is 85 V when the...Ch. 29 - Prob. 45P Ch. 29 - (I) A transformer has 620 turns in the primary...Ch. 29 - (I) Neon signs require 12 kV for their operation....Ch. 29 - (II) A model-train transformer plugs into 120-V ac...Ch. 29 - (II) The output voltage of a 75-W transformer is...Ch. 29 - (II) If 65 MW of power at 45 kV (rms) arrives at a...Ch. 29 - Prob. 51P Ch. 29 - (III) Design a dc transmission line that can...Ch. 29 - (III) Suppose 85 kW is to be transmitted over two...Ch. 29 - Prob. 54P Ch. 29 - (II) The betatron, a device used to accelerate...Ch. 29 - (III) Show that the electrons in a betatron,...Ch. 29 - (III) Find a formula for the net electric field in...Ch. 29 - Prob. 58GP Ch. 29 - A square loop 27.0 cm on a side has a resistance...Ch. 29 - Power is generated at 24 kV at a generating plant...Ch. 29 - Prob. 61GP Ch. 29 - Prob. 62GP Ch. 29 - A pair of power transmission lines each have a...Ch. 29 - Show that the power loss in transmission lines,...Ch. 29 - A high-intensity desk lamp is rated at 35 W but...Ch. 29 - Prob. 66GP Ch. 29 - A coil with 150 turns, a radius of 5.0 cm, and a...Ch. 29 - A search coil for measuring B (also called a flip...Ch. 29 - A ring with a radius of 3.0 cm and a resistance of...Ch. 29 - A flashlight can be made that is powered by the...Ch. 29 - A small electric car overcomes a 250-N friction...Ch. 29 - What is the energy dissipated as a function of...Ch. 29 - A thin metal rod of length rotates with angular...Ch. 29 - The magnetic field of a shunt-wound dc motor is...Ch. 29 - Prob. 75GP Ch. 29 - A circular metal disk of radius R rotates with...Ch. 29 - What is the magnitude and direction of the...Ch. 29 - Prob. 78GP Ch. 29 - Prob. 79GP Ch. 29 - Prob. 80GP

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The magnetic drag force that acts on the wire loop.

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The magnetic drag force that acts on the wire loop.

The terminal velocity of the loop before its upper horizontal side exits the field.

The terminal velocity of the loop when the loop is made up of copper and B=0.80 T.

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Chapter 29 Solutions