Attraction and Repulsion
Magnetic Fields and field Lines
Vocabulary
Identify the Independent and Dependent Variables
100
Julia puts two magnetic toy trains very close to each other on a track. What will happen next, and why?
The trains will move away from each other because the magnetic force will push the trains apart.
100
Please draw the magnetic field lines that a single magnet would have.
The magnetic field lines would connect from one pole to the other.
100
The pulling force that occurs when a magnetic field causes the domains in a nearby material to align, drawing the material toward the magnet.
What is attraction?
100
In an experiment where students test how the number of coils on an electromagnet affects how strong the electromagnet is, what is the independent variable?
What is the number of coils?
200
Please draw what is looks like when there are two misaligned magnets with like poles.
What are repulsion and attraction?
200
Please draw what repelling magnets look like.
What are lines that connect to the magnet's own poles and not the other magnet?
200
The space around a magnet in which magnetic forces act on objects
What is a magnetic field?
200
Students test how changing the number of coils on an electromagnet affects its strength. For each trial, they keep the battery and core the same, and they measure the maximum number of paperclips the electromagnet can lift before any fall off.
What is the dependent variable?
What is the number of paperclips lifted?
300
The image shows two magnets positioned with their like poles facing each other. Using what you know about magnetic field interactions, explain why the magnetic field between the magnets becomes more distorted and compressed as they move closer together, and how this distortion relates to the increasing repulsive force.
When like poles face each other, their magnetic field lines point in opposite directions in the space between them. As the magnets move closer, the field lines cannot merge, so they begin to bend, crowd, and compress against each other.
300
Based on the magnetic field line diagram, what will happen next with these two magnets?
They will repel
300
A magnet created by running electric current through a wire wrapped around a metal core.
What is an electromagnet?
300
A researcher investigates how the strength of an electromagnet changes when the number of wire coils is varied. They keep the current, core material, and temperature constant while measuring the magnetic field strength using a magnetic field sensor.
Identify the independent variable and the dependent variable.
Independent Variable:
Number of wire coils on the electromagnet
Dependent Variable:
Strength of the magnetic field (measured by the sensor)
400
Two bar magnets are placed five feet apart with opposite poles facing each other. Predict what will happen to the magnets.
At a distance of five feet, the magnetic force is too weak to cause any noticeable movement.
400
Earth's magnetic field lines point where?
What are the magnetic north pole to the magnetic south pole?
400
To make a magnetic field weaker.
What is demagnitize?
400
Students study how the distance from a current-carrying wire affects the force experienced by a moving charged particle placed in different positions around the wire. They keep the charge, speed of the particle, and current constant, but measure the magnetic force at various distances.
Identify the Independent and Dependent Variables.
Independent Variable:
Distance from the current-carrying wire
Dependent Variable:
Magnetic force acting on the moving charged particle
500
Two identical bar magnets are free to rotate on frictionless pivots. Magnet B starts with its opposite pole facing Magnet A. If Magnet B is slowly rotated so that like poles face each other, describe what happens to the force between the magnets and the configuration of the magnetic field lines.
As Magnet B rotates so that like poles face each other, the force between the magnets changes from attractive to repulsive.
500
Two bar magnets are placed so that the same poles (both north or both south) face each other. Describe what happens to the magnetic field in the space between the magnets. How strong is it, and what direction does it point?
When like poles face each other, the magnetic field lines repel and spread out between the magnets.
weak field, directions curve outward due to repulsion
500
Regions where magnetic dipole moments align outward or inward, creating maximum field interaction.
What is a magnetic pole?
500
In an experiment testing how the distance between a magnet and a compass affects the deflection angle of the compass needle, identify the independent and dependent variables.
IV: distance between magnet and compass
DV: compass needle deflection angle