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Magnetism & Electricity Page II
Load Stone  
The load stone is an Oxide of iron (Fe3O4). This a natural magnet. Helps you to study the characteristics of  a natural magnet. When suspended using string it oscillated until its North and South axis align with magnetic field of the earth.
Stirrup (with 4" bar magnet)  

Supports for bar magnets. Allows magnet to hang freely, when magnet placed on this support and suspended freely using thread, it helps us to study the directional property of magnets. Comes with 4" lenght, 1/2 " width , 1/4" thickness, pair of bar magnets.

Floating Magnet Set
The model comes with 5 ring magnets (25 mm diameter and 7 mm thickness) and acrylic rod mounted on a base. When magnets are inserted through the rod with their like poles facing each other, they simply float in air one over the other. A good new substitute to show attraction and repulsion properties of magnets.
Magnetic Field Pattern  
This model allows you to study the magnetic field due to various arrangements of magnets. After placing the magnet in the proper place if you sprinkle iron filings over the platform the iron filing align with the direction of the magnetic field and revels the fired pattern. Two bar magnets, two rectangular magnets and iron filing are part of the kit.
Magnetic Material Finder
An useful model which helps to classify magnetic and non-magnetic materials. It works on the behaviour of the material when it is placed in a magnetic field. That is whether the given material allows line of forces to pass through it or not.

This model allows you to see the action of an electromagnet. When the 'L' shaped 4 mm red coloured iron rod is placed in the alumminium stand and current is allowed to pass through the copper coil with iron core inside, the coil gets magnetised and becomes electromagnet. As a result, it attracts the iron rod which is in front of it. You can also demonstrate that repulsion is the sure test of magnetism not the attraction in the same model. For that you need to place both 'L' shaped 4 mm rod inside the copper wound coil and allow the current to flow through it.

Field Due To Solenoid
This model allows you to explore the magnetic field pattern produced by a solenoid (or an electromagnet) when current is passed through it. You can also compare this magnetic field pattern to the magnetic filed pattern produced by a bar magnet. Sprinkle iron filing on the platform above bar magnet and tap it gently. You will get a fired pattern due to bar magnet. Now sprinkle iron filing on the platform above the solenoid and pass current (12v, 3amp) through the solenoid. The iron filings align according to the direction of the field.

Relay Circuit  
This model demonstrates how switching one circuit causes one or more other circuits to be switched. When you push the bell push button, the first circuit is complete and the steal strip will be attracted towards the electromagnet. This make the strip to touch the bare wire. As a result the second circuit gets completed and the bulb in the second circuits glows.
Curie Point
Demonstrates how a Ferromagnetic material which attracts magnets gets converted into a paramagnetic material which repels a magnet after heating in a very effective way.
- Two alligator clips are provided for making connections.
- Use 12V, 3A DC battery for effective result.
Oersted Experiment
A simple model which explains the magnetic effect of current i.e when current flows through a conductor magnetic field is produced around the conductor. The model comes with acrylic stand to support brass rod, magnetic needle on stand and small blue coloured base. This model is made to study the behaviour of the magnetic needle when placed above the conductor also.
Ampere Model  
Useful for the study of the direction of the magnetic field around a straight conductor carrying current. The apparatus comes with a 'L' shaped brass rod fixed on a plastic base, with circular plastic plate around the vertical portion of the bar. The ends of the rod are provided with connecting leads. By placing small compasses near and around the vertical portion of the rod (on the circular platform), and passing current through the rod one can study the direction of the filed around the Straight conductor.
Field Due To Circular Coil
This model helps you to explore the magnetic field pattern in and around a circular coil carrying current. Sprinkle iron filings in and around the coil on the platform. Using transformer (12V, 3A) allow current to flow through the coil, the iron filings align with the direction of the magnetic field and gives you the idea of field pattern. You will observe that the field is circular around the coil and is straight at the center.
Field Inside An Open Circular Coil
This model uses plotting compasses to investigate the direction of the magnetic field inside and outside the circular coil. When you perform the experiment with this model you observe that the field inside the coil is in the opposite direction to the field outside the coil. 6V supply using dry cells is sufficient to perform the experiment.
Tangent Galvanometer  
This simple model allows you to study functioning of tangent galvanometer. A compass needle is pivoted at the center of circular circle coil of diameter 136mm. When current is pass through the coil using it produces magnet field and the compass will show the deflection depending on the strength of the current through the coil. The current flowing through the coil can be adjusted using variable not which is connected in series with coil.
Conductors and Insulators
Conductors are the one which allow electrons to flow through them easily where as insulators are the one which doesnot allow electrons to flow through them. This model helps you to study the behaviour of the conductors and insulators in an electrical circuit. This model also allows you to demonstrate how insulation coating on a copper wire works.
Working Of Resistor
We know that resister is used to control current in the circuit. A very high resistance allows very little current to flow. A low resistance allows a large amount of current to flow. This model allows you to verify the same
Simple Circuit Kit  
This kit consists of two single cell holders, 3 bulb holders, 3 bulbs, a switch and connecting wire. One can do the experiments related to Simple circuit, Open circuit, Closed circuit, resistance in series, resistance in parallel, cells in series and cell in parallel etc.,
Simplified model for experimental verification of Ohm's law using voltmeter and ammeter. This model reduces wire connection effort which is done in normal courses. With this model you can find out unknown value of resistance of a conductor. You can also verify the known value of resistance of conductor. It also allows you to verify laws of resistance in series and resistance in parallel. The model operates with 3V DC supply. Dry cells not included.
Variation Of Resistance (With Material)
Some materials have low resistance, where as some have much higher resistance. Metals like Copper, Brass etc., have very low resistance where Nichrome, Constantan etc., have very high resistance. This model helps you to verify the same. The model comes with coils of 4 different materials, namely Copper, Brass, galvanised iron and Nichrome wires. The model operates with 3V DC supply, one double cell holder with connecting pins is also included.
Dry cells not included.
Variation Of Resistance ( With Length And Diameter )  
An attractive model to demonstrate the resistance of a conductor decreases with increase in diameter and resistance of a conductor increases with increase in length of the conductor. The apparatus consist of 3 coils which are permanently mounted on a clear plastic base with connecting pins. In that first and second coils are of same length but of different diameter and second and third coils are of same diameter but of different lengths.
· An Indicator lamp is also provided, on the base.
· The apparatus comes with 4 cell holder box for use of 6V supply.
Page II
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