Difference between revisions of "Solenoid"
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| + | [[File:Solenoid.png|right|300px|thumb|A [[solenoid]] is made from a coil of [[wire]].]] | ||
A [[solenoid]] is a coil of [[wire]] which produces a [[Magnetic Field|magnetic field]], similar to that of a [[Bar Magnet|bar magnet]], when it has an [[Electrical Current|electrical current]]. | A [[solenoid]] is a coil of [[wire]] which produces a [[Magnetic Field|magnetic field]], similar to that of a [[Bar Magnet|bar magnet]], when it has an [[Electrical Current|electrical current]]. | ||
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:*The [[Electrical Current|current]] in the coil - The greater the [[Electrical Current|current]] the stronger the [[Magnetic Field|magnetic field]]. | :*The [[Electrical Current|current]] in the coil - The greater the [[Electrical Current|current]] the stronger the [[Magnetic Field|magnetic field]]. | ||
:*The number of coils - The greater the number of coils the stronger the [[Magnetic Field|magnetic field]]. | :*The number of coils - The greater the number of coils the stronger the [[Magnetic Field|magnetic field]]. | ||
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| + | {| class="wikitable" | ||
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| + | |[[File:MagneticFieldLinesSolenoid.png|center|500px]] | ||
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| + | | style="height:20px; width:200px; text-align:left;" |This [[diagram]] shows the [[Magnetic Field|magnetic field lines]] of a [[solenoid]]. | ||
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Revision as of 13:58, 4 March 2019
Key Stage 4
Meaning
A solenoid is a coil of wire which produces a magnetic field, similar to that of a bar magnet, when it has an electrical current.
About Solenoids
- Solenoids can be used to magnetise a magnetic material.
- Solenoids have a uniform magnetic field inside the coil of wire and a non-uniform magnetic field outside the coil, similar to that of a bar magnet.
- The magnetic field is strongest inside the coil.
- Solenoids are not magnets themselves, but they are part of an electromagnet. To turn a solenoid into an electromagnet it needs a soft iron core.
- The strength of a solenoid depends upon:
- The current in the coil - The greater the current the stronger the magnetic field.
- The number of coils - The greater the number of coils the stronger the magnetic field.
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| This diagram shows the magnetic field lines of a solenoid. |