Table of Contents
- 1 What is a coil that is magnetized only when an electric current flows through it?
- 2 How does the coil behave when electric current flows?
- 3 Do coils block direct current flow?
- 4 How does the number of field lines through a coil affect the current?
- 5 What happens when the magnetic flux through a wire changes?
What is a coil that is magnetized only when an electric current flows through it?
An electromagnet is a coil of wire with an electric current flowing through it. When the wire is coiled around in a cylinder, we call this a solenoid. The solenoid becomes an electromagnet when a current flows through it.
What happens when an electric current passes through a coil?
Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely, an external time-varying magnetic field through the interior of the coil generates an EMF (voltage) in the conductor. The more turns of wire, the stronger the field produced.
How does the coil behave when electric current flows?
Wind the wire tightly around the nail in the form of a coil. The coil in the above activity behaves like a magnet when electric current flows through it. When the electric current is switched off, the coil generally loses its magnetism. Such coils are called electromagnets.
What happens to the coil when current flows through it what happens when the current is increased?
When the current is broken the field collapses, the magnetic lines of force in the field cut through the coil windings creating a new higher voltage than was induced resulting in higher current for a split second resulting in a larger longer spark than was seen when the connection was made.
Do coils block direct current flow?
A ferrous or other magnetic core material will have magnetism induced in it. When DC current flows through any coil, it creates its electric & magnetic field. Instead the coil would be like a long piece of wire without much resistance. When the coil is disconnected this magnetic field will collapse.
How is current induced in a magnetic coil?
Lenz’s Law. The current that is induced in a coil (due to a magnetic flux change through the coil) will always be such that it opposes the change that caused it. Put another way: Any induced current in a coil will result in a magnetic flux that is opposite to the original changing flux.
How does the number of field lines through a coil affect the current?
Change in the number of field lines through a coil gives a current. Number of field lines through a coil is called magnetic flux. When a loop is moved parallel to a uniform magnetic field, there is no change in the number of field lines passing through the loop and no induced current.
Can a moving charge produce a magnetic field?
Yes-A moving charge produces a magnetic field. A current-carrying coil of wire with many loops is called a(n) _______________. electromagnet What happens to a current carrying wire when it is passed through a magnetic field? It is deflected up or down, ┴ to the magnetic field lines. The earth is a large magnet.
What happens when the magnetic flux through a wire changes?
If the magnetic flux through a loop of wire changes for any reason either by changing the area, A, of the loop or the field, B, through the loop Then an EMF (voltage) will be induced in the wire. This voltage will cause a current to flow (the induced current in the loop).