Recent content by Da Apprentice

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    Development of Magentic force equation to include angle

    Hi All, B = μonI I am trying to adapt this formula to include a dependence upon the angle made by the coils relative to the cylindrical core of the electromagnet. For example it is known that the number of coils (n) that can be formed around a cylinder should be dependent upon the length of...
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    What Is The Relationship Between Temperature and Magnetic Force?

    The temperature of the coils was determined in two ways, one was using a heat gun which returned that the temperature reached was approximately 72°C, while the other was heating a cylinder filled with water with the electromagnet and using Q=mcΔT to determine the temperature: this returned a...
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    What Is The Relationship Between Temperature and Magnetic Force?

    Thanks for the reply, Thank you :) Sorry I forgot to state that the magnet is actually an electromagnet not a permanent magnet. Does your statement that there shouldn't be much of a change in magnetic properties until the threshold temperature is reached apply to both forms of magnets or...
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    What Is The Relationship Between Temperature and Magnetic Force?

    Hi All, In an experiment I ran to determine the trend between distance and magnetic force (produced by an electromagnet) the result showed that the trend was either an inverse quartic or inverse quintic function. Such a result was unexpected as the trend is documented as being an inverse cubic...
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    Trend of Electromagnetic Temperature

    no in total we ran the experiment at 6 different voltages and an additional point was assumed (at 0,0) because with no voltage the magnet doesn't increase in temperature and therefore no energy would be exchanged between the two. The graph is attached. Thanks for the reply. Z.C.
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    Square Base Heat Sink: Physics Test Q&A

    http://www.wisegeek.com/what-is-a-fanless-heatsink.htm, - 3rd paragraph. "A heatsink has a square base designed to fit over the chip face." - From that I'm assuming it's a matter of compatibility with the chip.
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    Square Base Heat Sink: Physics Test Q&A

    I'm no expert but: http://en.wikipedia.org/wiki/Heat_sink#Fin_arrangements, that might help.
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    Trend of Electromagnetic Temperature

    In order to determine the temperature that an electromagnet reached after a 3 minute period the electromagnet was placed in a constant volume of water. After 3 minutes the change in temperature of the water was measured and from this using the equation Q=mcΔT the energy in joules transferred was...
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    Why Does Voltage Versus Energy Exchange in an Electromagnet Show a Linear Trend?

    Good one Darren But seriously can anyone explain why the result would be linear or confirm that it should in fact have been parabolic? Any help would be much appreciated. Thanks Z.C
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    Magnetic Force Inverse Cubed Law?

    I was reading <crackpot link removed> and was wondering if the inverse cube law for magnetic force still applied for situations where the object being attracted isn't another magnet itself? E.g. if there is an electromagnet attracting an iron nut is the rule still inverse cube and not inverse...
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    Why Does Voltage Versus Energy Exchange in an Electromagnet Show a Linear Trend?

    In order to determine the temperature that an electromagnet reached after a 3 minute period the electromagnet was placed in a constant volume of water. After 3 minutes the change in temperature of the water was measured and from this using the equation Q=mcΔT the energy in joules transferred...
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    Why can the mixing of acids and bases be dangerous

    Yeah this helps heaps, Thanks
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    Why can the mixing of acids and bases be dangerous

    I tried googling this topic and basically all I could find was sites saying they neutralise each other - I know that. But why is it that when you mix say a drop of pH 14 solution with a lot of pH 1 solution that they react rather violently and the acid sprays everywhere? If someone could maybe...
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    Increased Density Results in Decreased speed of sound?

    According to the equation c=√(C/ρ) where c is the speed of sound, C is the coefficient of stiffness and ρ is the density of the medium throughout which a sound is played the speed of sound should acctually decrease with an increase in density. Why is this so? I would've thought that increasing...
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    Can Mixing Different pH Indicators Broaden Detection Range in Spectrophotometry?

    As an experiment I was going to investigate the use of a spectrophotometre as a pH meter by using different chemical indicators which should change colour depending upon the pH of the substance. I know that indicators such as bromthymol blue only experience a distict change in colour over a pH...
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