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[1] http://www.gcsescience.com/pme5.htm

[2] http://www.s-cool.co.uk/a-level/physics/magnetic-fields/revise-it/effect-of-ferrous-cores-and-the-relationship-between-curre [3] http://www.bbc.co.uk/bitesize/ks3/science/energy_electricity_forces/magnets_electric_effects/revision/4/ [4] http://www.howmagnetswork.com/Electromagnetism.html

[5] http://www.wisegeek.com/what-is-a-solenoid-door-lock.htm [6] http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html

The form of a magnet field around a solenoid

http://www.gcsescience.com/pme5.htm

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How to enhance a permanent magnetic field about / within a solenoid

http://www.s-cool.co.uk/a-level/physics/magnetic-fields/revise-it/effect-of-ferrous-cores-and-the-relationship-between-curre Electromagnets all consists of a current carrying conductor, nevertheless the strength of the magnetic field produced likewise depends on the encircling substance. Atmosphere is not really particularly great at ‘carrying’ a magnetic field and so the discipline around a wire is quite weak. By placing core in a6105 coil the strength of the permanent magnetic field can be increased.

Simply by putting a metallic (iron) main inside a the solenoid, the field lines will be concentrated.

This has the result of strengthening the discipline. Inside the core, the field lines are much closer with each other ‘ more robust field. Iron is a especially good main for solenoids as it is quickly magnetised and demagnetised. Therefore when the current is switched off the straightener does not stay magnetic. Iron is said to be magnetically soft. http://www.bbc.co.uk/bitesize/ks3/science/energy_electricity_forces/magnets_electric_effects/revision/4/ Making a great electromagnet better

We can make an electromagnet more robust by doing these things: wrapping the coil about an straightener core

adding more turns to the coils

Elevating the current streaming through the coils.

The magnet field of your electromagnet

The magnet field about an electromagnet is just the identical to the one around a bar magnet. It can, however , be turned by turning the electric battery around. As opposed to bar magnets, which can be permanent magnets, the magnetism of electromagnets can be switched on and away just by concluding or starting the move.

Solenoids since magnets

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html

What sort of solenoid the magnet that could be switched on or off http://www.howmagnetswork.com/Electromagnetism.html

Solenoids

The solenoid can be described as long coils containing a lot of close converts of protected copper line. The magnetic field manufactured by a current having solenoid is just like the permanent magnet field manufactured by a bar magnet.

The lines of magnetic force pass through the solenoid and return to the other end. When a current carrying solenoid is definitely suspended openly, it comes to relax pointing North and To the south like a revoked magnetic hook. One end of the solenoid acts like a N-pole and the other end a S-pole. Since the current in each spherical turn of the solenoid runs in the same direction, the magnetic discipline produced by every turn of the solenoid can add up, giving a good resultant magnet field within the solenoid.

A solenoid is employed for making electromagnets. The strength of permanent magnetic field created by a current transporting solenoid can be: 1 . Straight proportional for the number of turns in the solenoid 2 . Immediately proportional to the strength of current inside the solenoid 3. Dependent on the size of “core material used in producing the the solenoid. The use of smooth iron pole as main in a the solenoid produces the strongest magnetism.

How a solenoid can be used to protected a door

http://www.wisegeek.com/what-is-a-solenoid-door-lock.htm

A solenoid door lock can be described as remote door locking mechanism that latches or opens by way of an electromagnetic solenoid. In most cases, the actual locking mechanism of a solenoid door lock will be identical to a regular key-operated model. The only big difference between the two is the add-on of a low-voltage solenoid inside the mechanism, which will pulls the latch back into the door when a push press button or different controller can be activated.

The latch are retained inside the door for as long as the button is pushed, or, in the matter of a latching solenoid, indefinitely until the button or control is activated again. These types of door hair are used extensively in remote control security access and automobile doors. As solenoids are like electromagnets, they can be switched on and off.

The use of this is certainly that a good magnet could possibly be used to continue to keep a door shut when a ‘key’ is triggered, the current going to the the solenoid is cut-off, allowing the doorway to open. As the door is definitely shut again, the circuit is closed/completed again plus the magnet retains the door set up again. Even though the locking solenoid will keep these devices locked, it is not necessarily technically upon when in locking method, because no power will be used.

The solenoid just needs electric power when unlocking and, since most gadgets are consistently locked, very little energy is definitely ever needed by the the solenoid. For this reason, most solenoids operate on battery power, as well as the battery almost never needs to be altered.

The majority of these types of solenoids are made to be small , and because they fit in little devices, but there are some which can be large and exhibit powerful electromagnetic pushes. Heavy-duty solenoids are used in construction gear, such as forklifts, to locking mechanism the mast when the equipment is off or perhaps not functioning. Unlike small solenoids that exhibit the force of around 45 Newtons, these greater solenoids use about you, 000 Newtons to secure the equipment in place.

When a door or unit locks via a solenoid, it is using fundamental electromagnetic makes to control the lock. The solenoid suits the fasten and, when ever locked, will certainly expand and so the device can not be unlocked simply by sheer force. An electromagnetic force, for example a keycard, is necessary to tell the solenoid to move, allowing the device to unlock and available. Convert:

http://www.digitaldutch.com/unitconverter/force.htm

forty five newton’s=4. 588723 kilograms force. This means 4. 588723 kg is used on keep the door shut. This kind of relatively low locking power is actually alternatively

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