Concept explainers
On an enlargement of the figure below, sketch field lines representing the magnetic field of the bar magnet. Show the field both inside and outside the magnet.
On the diagram, indicate the direction of the current through the wire when the circuit is complete.
Predict the direction of the force exerted on the wire by the magnet when the circuit is complete. Explain.
Check your prediction (Do not leave the battery connected for more than a few seconds. The battery and wires will become hot if the circuit is complete for too long.)
To Draw: Magnetic field due to a bar magnet.
The direction of current inside the circuit and the direction of force.
Explanation of Solution
Introduction:
Direction of magnetic field is from north pole to south pole outside the magnet. There is no magnetic field inside the bar magnet.
After closing the circuit, the current will flow from right to left. i.e. current will flow clockwise. This is because, the current induced in the circuit always opposes the change.
Direction of force can be calculated by using Fleming’s right-hand rule.
By this rule, three fingers of right hand are stretched such that thumb, first finger, middle finger are at 90 degrees to each other. If the first finger points along the direction of magnetic field, the middle finger points in the direction of the current, then the thumb will give the direction of force.
Applying this rule in the given condition, direction of force will be outside the paper.
Conclusion:
Direction of current is from right to left hand. The direction of force is out of the paper.
Want to see more full solutions like this?
Chapter 7 Solutions
Tutorials in Introductory Physics
Additional Science Textbook Solutions
The Cosmic Perspective
Sears And Zemansky's University Physics With Modern Physics
University Physics Volume 1
Essential University Physics: Volume 1 (3rd Edition)
Conceptual Physics (12th Edition)
An Introduction to Thermal Physics
- A portion of a long, cylindrical coaxial cable is shown in the accompanying figure. A current I flows down the center conductor, and this current is returned in the outer conductor. Determine the magnetic field in the regions (a)arrow_forwardThe copper sheet shown below is partially in a magnetic field. When it is pulled to the right, a resisting force pulls it to the left. Explain. What happen if the sheet is pushed to the left?arrow_forwardA current I flows around a wire bent into the shape of a square of side a. What is tire magnetic field at the point P that is a distance z above the center of the square (see the accompanying figure)?arrow_forward
- A transmission line strung 7.0 m above the ground carries a current of 500 A. What is the magnetic field on the ground directly below the wire? Compare your' answer with the magnetic field of Earth.arrow_forwardFor the coils in the preceding problem, what is the magnetic field at the center of either coil?arrow_forwardCASE STUDY Measuring the Magnetic Field Near a Bar Magnet Suppose you have a bar magnet (Fig. 30.4, page 936) and you want to find the magnetic field strength along the magnets axis as a function of distance from one of the poles. Explain how you could use a small compass to achieve your goal.arrow_forward
- Calculate the magnetic force on a hypothetical particle of charge 1.010l9C moving with a velocity of 6.0104im/s in a magnetic field of 1.2kT.arrow_forwardUse Lenzs law 10 answer the following questions concerning the direction of induced currents. Express your answers in terms of the letter labels a and b in each part of Figure P.31.22. (a) What is the direction of the induced current in the resistor R in Figure P.S1.22a when the bar magnet is moved to the left? (b) What is the direction of the current induced in the resistor R immediately after the switch S in Figure P31.22b is closed? (c) What is the direction of the induced current in the resistor R when the current I in Figure P31.22c decreases rapidly to zero?arrow_forwardIf you cut a bar magnet into two pieces, will you end up with one magnet with an isolated north pole and another magnet with an isolated south pole? Explain your answer.arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningGlencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning