Physics E401 Magnetic Fields And Magnetic Force Analysis/conclusion 4774i

Analysis On the first part of the experiment, the group discovered the magnetic field lines of certain magnets using iron filings. The results were that the Iron filings, when sprinkled over the piece of paper covering the magnets, aligned themselves in a pattern, connecting both north and south poles of the magnet (or connecting north and south poles of two magnets, or the north and south poles to a piece of iron). These are the magnetic field lines, which flow from the north pole of the magnet, to the south pole, running through the magnet. In case of when a magnet is brought within the field of another magnet, the magnetic field lines interact with each other, with field lines forming from the north poles of the magnet, connecting to the south poles of the other. Interacting with a metal object in between (in this case, the iron ring), the magnetic properties of the metal interact with the magnet, expressing signs of magnetic force acting on it and the metal, pulled together. The magnetic field lines also suggest that if we lay down two magnets, with the same polarity facing each other, they would be repelled by the magnetic force instead. For the second part of the experiment, a conductor, with a current ing through it, was interacting with a set of magnets placed on a reset weighing scale, with several variables being the number of magnets, the length of the conductor, the current, and the orientation of the conductor. Based on our observations, if the number of magnets are variable, and all other factors held constant, the magnetic force generated seems to be increasing. This is due to the increase in the amount of magnetic field interacting with the conductor, since the weight of the magnets themselves are mitigated by the reset of the scale to zero whenever the number of magnets are changed. Next, as current is variable, and all other factors held constant, an increase in the magnetic force is also observed, also suggesting that there is a direct relationship between the amount of current and the magnetic force. Albeit there are some inaccuracies, it is mainly due to

the equipment being very inaccurate due to the limitations of a single decimal place reading. Also, this proves the formula Fmag(max) = ILB sin(ɸ) to be valid (sin(ɸ) = 1). Change in length also shows the same relationship with the magnetic field - another proof that the above equation is valid. A similar increase can be seen with the change in the orientation of the coil. However, in that case, the maximum will be different, as the angle between the current vector and the magnetic field will have changed. However, since sin(ɸ) sin(ɸ)

≠

1, ɸ is variable, but Fmag = ILB

will still be valid. Since the function is a sine function, the increase in the angle

corresponds to the increase in the magnetic force experienced, just as it is in the results. The angle decrease in the negative side only changes the direction of the vector of the magnetic force, and the sign of the magnitude, proven by Fmag = ILB sin(ɸ), since sin(-ɸ) = -sin(ɸ) .

Conclusion Based on the results of this experiment, I can say that the magnetic field lines are the representations of the extent of influence of magnetic force, and that they connect from north to south pole. Another conjecture is that magnetic field lines change form when another magnet is inside its field, or if an object with magnetic properties enters. To summarize the findings for the second part of the experiment, the magnetic force can be simplified to a formula F mag = ILB sin(ɸ), with I being the current, L being the length of the conductor, B being the magnitude of the magnetic field, and ɸ the angle between the two vectors, each factor being in direct proportion to the magnetic force experienced by an object.