The Physics Of Magnetic Field - 867 Words

When a wire with current flowing through it, is placed in a magnetic field a force is placed on the wire: this is the motor principle and this is the principle behind the loud speaker. Hello, My name is Michael Trevorrow and you will be learning about the loud speaker and electromagnetism. But first, if you want to understand the loud speaker you have to understand electromagnetism. Well electromagnetism is simply ‘the phenomenon of the interaction of electric currents or fields and magnetic fields’. This will become clearer later. All right the loud speaker we all know what they look like, but we don’t know how they work. When things shake or vibrate, they produce a sound. If a coil is wrapped around a magnet, the coil now becomes an†¦show more content†¦The formula for a solenoid is B=u0nl, where n is the number of coils and I is the current. Being able to show the strength, will show the loudness because the current flow alters the frequency and altering the current flow will make the solenoid field larger. Coils and changing direction A conductor, copper, is tightly wrapped around a magnet to make a magnetic field. But how does this create sound? The coil has a current flowing through it the coil moves and the polar orientation reverses. When this is reversed it allows the magnetic forces between the coil and this allows the coil to move up and down the magnet, which creates sound. The magnetic field can be increased by putting more coils around the magnetic which leads to larger sound. Current Current is the driving force which causes the diaphragm acceleration. Current is a flow of electricity which results from the ordered directional movement of electrically charged particles. In simple terms current is the flow of electricity throughout the coil. Current is how we can change the frequency or sound pitch of the speaker, by altering voltage it will change the current. Now we know what happens inside a speaker, lets have a look at the magnets involved. Electromagnet (coil Electromagnets An electro magnet is a type of magnet in which a magnetic field is created by a current, in our case of the