Magnetic Fields and Electric Current (Leaving Cert Physics): Flashcards
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Magnetic field definition
Magnetic field definition
Region of space where magnetic forces can be detected
Direction of magnetic field at a point
Direction of magnetic field at a point
Direction a north pole would experience force
Direction of magnetic field lines
Direction of magnetic field lines
Away from north poles, towards south poles
What closer magnetic field lines indicate
What closer magnetic field lines indicate
Stronger magnetic field
Can magnetic field lines cross each other?
Can magnetic field lines cross each other?
No, field lines cannot intersect
Who discovered electric current creates magnetic field?
Who discovered electric current creates magnetic field?
Hans Christian Oersted in 1819
What does electric current in a conductor produce?
What does electric current in a conductor produce?
Magnetic field around the conductor
Effect of reversing current on compass needle
Effect of reversing current on compass needle
Needle deflects in opposite direction
Effect of higher current on magnetic field
Effect of higher current on magnetic field
Stronger magnetic field produced
Right-hand grip rule: thumb direction shows
Right-hand grip rule: thumb direction shows
Direction of conventional current flow
Right-hand grip rule: curled fingers show
Right-hand grip rule: curled fingers show
Direction of circular magnetic field lines
What is a coil?
What is a coil?
Several wire loops wound together
What is a solenoid?
What is a solenoid?
Coil where length is much greater than diameter
Magnetic field inside a solenoid
Magnetic field inside a solenoid
Parallel and uniform
What is an electromagnet?
What is an electromagnet?
Solenoid with ferrous core inserted inside