Magnetism and the Motor Effect Flashcards
At which part of a magnet are the magnetic forces strongest
The poles of the magnet
What happens when 2 magnets are brought close to each other
They exert a force on each other
What type of force is exerted if 2 like poles of a magnet are brought near each other
A repulsive, non-contact force
What type of force is exerted if 2 unlike poles of a magnet are brought near each other
An attractive, non-contact force
What is a magnetic field
The region surrounding a magnet where another magnet or magnetic material experiences a non-contact force
What is the difference between a permanent magnet and an induced magnet
- A permanent magnet produces its own magnetic field
- An induced magnet becomes magnetic when placed in a magnetic field
What type of force does induced magnetism always cause
A force of attraction
What is the effect when an induced magnet is removed from a magnetic field
The induced magnet loses most/all of its magnetism
Give 4 examples of magnetic materials
- Iron
- Steel
- Cobalt
- Nickel
What can always be said about the force between a magnet and a magnetic material
It is always attractive
How does the strength of a magnetic field alter as you move further away from the magnet producing it
The magnetic field strength decreases the further you move away
In what direction does a magnetic field point
- In the direction of the force that a north pole would experience if placed in the field
- From the north seeking pole to the south seeking pole of a magnet
What does a magnetic compass contain
A small bar magnet that points in the direction of the Earth’s magnetic field
What is produced when current flows through a conducting wire
A magnetic field is produced around the wire
What determines the strength of the magnetic field around a current-carrying wire
The magnitude of the current flowing through the wire
Does a high concentration of field lines mean the field is strong or weak
Strong
True or False: magnetic field lines never cross each other
True; they never cross, touch, or overlap
How is a plotting compass used to map out a magnetic field
- Place a compass on a pieve of paper near the field
- Draw an arrow in the direction the compass points
- Repeat at different points on the paper
- Join the arrows to make a complete field pattern
What is a solenoid
A coil of wire which when current passes through creates a strong magnetic field
Describe the magnetic field found inside a solenoid
Strong and uniform
Is the field on the outside of a solenoid strong or weak and why
Weak: The fields from each coil cancel out, making the outside field weak
What is an electromagnet
- A solenoid with an added iron core
- Adding the iron core increases the strength of the magnetic field
What is the motor effect
When a force is exerted between a magnetic field and a current-carrying conductor placed in that field
What rule is used to determine the force produced by the motor effect
Flemings Left-Hand rule
