College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 21, Problem 12P
(a)
To determine
The direction of the current in a bulb when the switch is being turned off and the current in the coil A is increasing in an experiment that consists of two insulated wires wrapped around a cardboard tube.
(b)
To determine
The direction of the current in a bulb when the switch has just been turned off and there is a steady current in coil
(c)
To determine
The direction of the current in a bulb when the switch has just been turned on and the current in the coil is decreasing.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
A spacecraft orbiting the Earth has a coil of wire in it. An astronaut measures a small current in the coil, although there is no battery connected to it and there are no magnets on the spacecraft. What is causing the current?
A square, 44.0-turn coil that is 13.0 cm on a side with a
resistance of 0.900 2 is placed between the poles of a large
electromagnet. The electromagnet produces a constant,
uniform magnetic field of 0.400 T directed into the screen. As
suggested by the figure, the field drops sharply to zero at the
edges of the magnet. The coil moves to the right at a constant
velocity of 3.10 cm/s.
N-turn
coil
B into the screen
V
True or False
A moving charge entering a magnetic field parallel to the field will move in a straight line.
A man whose resistance is 10,000 Ω has 120 volt potential difference across his body. This would cause a fatal shock.
Adding resistors to a parallel circuit decreases the equivalent resistance.
The resistance of a resistor increases with decreased temperature
The terminal voltage (V) of a battery is always less than its EMF (ξ).
The electric field E is a scalar but the electric potential V is a vector.
Chapter 21 Solutions
College Physics
Ch. 21 - Review Question 21.1 Your friend thinks that...Ch. 21 - Review Question 21.2 You have a bar magnet and a...Ch. 21 - Review Question 21.3 What difficulty would occur...Ch. 21 - Review Question 21.4 Why do we write the law of...Ch. 21 - Review Question 21.5 How does the law of...Ch. 21 - Review Question 21.6 A capacitor in an electric...Ch. 21 - Prob. 7RQCh. 21 - Review Question 21.8 Explain how (a) an electric...Ch. 21 - 1. In which of the experiments with a loop and a...Ch. 21 - If you move the coil in Figure Q21.2 toward the N...
Ch. 21 - The magnetic flux through a 100-cm2 loop is...Ch. 21 - Your friend says that the emf induced in a coil...Ch. 21 - 5. A metal ring lies on a table. The S pole of a...Ch. 21 - 6. One coil is placed on lop of another The bottom...Ch. 21 - Two coils are placed next to each other flat on...Ch. 21 - 8. Two identical bar magnets are dropped...Ch. 21 - A windows metal frame is essentially a metal loop...Ch. 21 - Four identical loops move at the same velocity...Ch. 21 - A 12-V automobile battery provides the thousands...Ch. 21 - A respiration detector consists of a coil placed...Ch. 21 - A parallel plate capacitor and a lightbulb are...Ch. 21 - Prob. 14MCQCh. 21 - A bar magnet falling with the north pole facing...Ch. 21 - 16. An induction cooktop has a smooth surface When...Ch. 21 - Describe three common applications of...Ch. 21 - 18. Two rectangular loops A and B are near each...Ch. 21 - A simple metal detector has a coil with an...Ch. 21 - 20. Construct flux-versus-time and emf-versus-time...Ch. 21 - How is it possible to get a 2000-V emf from a...Ch. 21 - You connect a capacitor and a lightbulb in series...Ch. 21 - Prob. 23CQCh. 21 - * You and your friend are performing experiments...Ch. 21 - You decide to use a metal ring as an indicator of...Ch. 21 - * To check whether a lightbulb permanently...Ch. 21 - * Flashlight without batteries A flashlight that...Ch. 21 - You need to invent a practical application for a...Ch. 21 - * Detect burglars entering windows. Describe how...Ch. 21 - 7. * A coil connected to an ammeter can detect...Ch. 21 - * The B field in a region has a magnitude of 0.40...Ch. 21 - 9. EST How do you position a bicycle tire so that...Ch. 21 - * EST Estimate the magnetic flux through your head...Ch. 21 - 11. * Estimate the magnetic flux through the...Ch. 21 - Prob. 12PCh. 21 - 13. You have the apparatus shown in Figure P21.13....Ch. 21 - * You suggest that eddy currents can stop the...Ch. 21 - * Your friend thinks that an induced magnetic...Ch. 21 - The magnetic flux through three different coils is...Ch. 21 - 17. The magnetic flux through three different...Ch. 21 - 18. A magnetic field passing through two coils of...Ch. 21 - BIO Stimulating the brain in transcranial magnetic...Ch. 21 - * To measure a magnetic field produced by an...Ch. 21 - Prob. 21PCh. 21 - 22 * BIO Breathing monitor An apnea monitor for...Ch. 21 - 23. * A bar magnet induces a current in an -turn...Ch. 21 - * An experimental apparatus has two parallel...Ch. 21 - A Boeing 747 with a 65-m wingspan is cruising...Ch. 21 - Prob. 27PCh. 21 - 28. ** BIO EST Magnetic field and brain cells...Ch. 21 - * You need to test Faraday's law You have a...Ch. 21 - 30. * You build a coil of radius r (m) and place...Ch. 21 - * EST Generator for space station Astronauts on a...Ch. 21 - 35. * A toy electric generator has a 20-tum...Ch. 21 - 36. * A generator has a 450-turn coil that is 10...Ch. 21 - 39. * A generator has a 100-turn coil that rotates...Ch. 21 - Prob. 40PCh. 21 - * A rectangular wire loop is moving with constant...Ch. 21 - field that points into the page (Figure P21.42)....Ch. 21 - 43. The voltage across an AC power supply is given...Ch. 21 - 44. * The alternating current through a capacitor...Ch. 21 - * The alternating current through a solenoid is...Ch. 21 - 46. * The rms voltage of household AC in Europe is...Ch. 21 - Prob. 47PCh. 21 - Prob. 48PCh. 21 - 49. You need to build a transformer that can step...Ch. 21 - 50. Your home’s electric doorbell operates on 10...Ch. 21 - 51. A 9.0-V battery and switch are connected in...Ch. 21 - * You are fixing a transformer for a toy truck...Ch. 21 - 53. * A wire loop has a radius of 10 cm. A...Ch. 21 - BIO Hammerhead shark A hammerhead shark (Figure...Ch. 21 - ** You have a 12-V battery, some wire, a switch,...Ch. 21 - 61.* EST A sparker used to ignite lighter fluid in...Ch. 21 - * EST Design a magnetometer Your friend needs to...Ch. 21 - Prob. 63GPCh. 21 - 64 EST MRI Jose needs an MRI (magnetic resonance...Ch. 21 - * Magstripe reader A magstripe reader used to read...Ch. 21 - 66. Show that when a metal rod L meters long moves...Ch. 21 - 67. ** EST The Tower of Terror ride Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A 227-turn circular coil of radius 24 cm is perpendicular to a uniform magnetic field of 0.55 T. During a 0.75 s time interval, this field increases to 1.7 T. If the resistance of the coil is 11.5 ohm, calculate the average emf and current that flows in the coil during this interval. The average emf, Emf = 47.23 V Units V The average current, i = 5.5 x Units Aarrow_forwardA circuit is made with a resistor of resistance 25 ohms and a movable bar with length 15 cm moving to the left with speed 8 m/s. The whole circuit is in a magnetic field B = 1.5 T (into page). Use this set up to answer the following questions. What is the magnitude of the power delivered to the bar by the force pushing it in watts? Answer to 4 decimal places.arrow_forwardA 105-turn square wire coil of area 0.040 m2 rotates about a vertical axis at 1,800 rev/min, as indicated in the figure below. The horizontal component of Earth's magnetic field at the location of the loop is 2.0 ✕ 10−5 T. Calculate the maximum emf (in V) induced in the coil by Earth's field.arrow_forward
- Suppose that the light bulb in Figure 22.4b is a 60.0-W bulb with a resistance of 214 Ω. The magnetic field has a magnitude of 0.603 T, and the length of the rod is 0.603 m. The only resistance in the circuit is that due to the bulb. What is the shortest distance along the rails that the rod would have to slide for the bulb to remain lit for one-half second?arrow_forwardThe long straight wire in the figure has current I = 1 A flowing in it. A square loop which has 10-cm sides is positioned 10 cm away from the wire as shown. The loop is then moved in the positive x-direction with a speed v = 10 cm/s. If the loop has a resistance of 0.02 ohms, calculate the direction and the magnitude of the net force acting on the loop the instant the loop is made to move.arrow_forwardThe magnetic flux that passes through one turn of a 15-turn coil of wire changes to 4.72 from 8.90 Wb in a time of 0.0572 s. The average induced current in the coil is 286 A. What is the resistance of the wire? The answer is not 0.2555 or 3.0327arrow_forward
- A long, straight wire (blue in the diagram) carries a current (moving toward the right) of i(t) = [(5.0A)− (2.0 A/s^2)t^2]. A circular loop (red) of radius 1.5 m and resistance 1.8 Ω is centered on and lying directly on top of the blue wire (but, since the wires are insulated, there is no electrical contact between them). What is the magnitude of the current induced in the red loop at time t = 1 s?arrow_forwardA flat coil of wire has an area A, N turns, and a resistance R. It is situated in a magnetic field, such that the normal to the coil is parallel to the magnetic field. The coil is then rotated through an angle of 90˚, so that the normal becomes perpendicular to the magnetic field. The coil has an area of 1.5 × 10-3 m2, 50 turns, and a resistance of 150 Ω. During the time while it is rotating, a charge of 6.0 × 10-5 C flows in the coil. What is the magnitude of the magnetic field?arrow_forwardA loop of wire enclosing an area of 0.09m2 has a magnetic field passing through its plane at an angle to the plane. The component of the field perpendicular to the plane is 0.12 T, and the component parallel to the plane is 0.05 T. What is the magnetic Flux through this coil? The magnetic Flux through the coil is _____T•m2.arrow_forward
- Consider a 12-loop coil with a diameter of 8 cm; a north-leading bar magnet moves further away from the coil (where the bar magnet is perpendicular to the cross section of the coil, and the north pole is closest to the coil as the magnet moves away). The magnetic field value changes from 0.065 T to 0.00065 T in 1.6 s. What is the change in flux for the coil? ΔΦ = T⋅m2arrow_forwardA generator has a 46-turn coil with an area of 0.07 m2 that turns at 25.0 rad/s in a 0.48 T magnetic field. What is the current through the coil when the normal to the coil makes an angle of 30o with the magnetic field? The resistance in the coil is 7.84 Ohms. Give your answer in Amperes.arrow_forwardThe emf of a coil rotating in a magnetic field is zero at t=0, and the coil rotates at an angular velocity of 12 rad/s. At what time (in seconds) is the emf first at its most negative? Your answer should be a number with three decimal places, do not include the unit. Brushes E ha 2x T= (0 Eoarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning