physics investigation - investigating the force acting on a wire?

Question

i have to write a physics investigation and I am greatly struggling, i have to write an aim, the variables.a hypotheis, method etc but its been a long time since i did the experiment so need a little help with understanding the physics behind the experiment, the title is:

to investigate how the force acting on a wire, due to a magnetic field, depends on the current flowing in the wire.

To do the experiment we made a u shaped magnet by placing the two magnadur magnets on the steel yoke with opposite poles facing each oter

we placed the magnet on the top-pan balnce to read 0

we arrange a stiff copper wire to pass centraly between the poles of the magnet

we assembled a circuit to provide a variable

i gathered some results and found the reading on the balance to go up when the current goes up ? why?? is this?? anyone got any help or advice?

Answer 1

The movement of electrons in the wire (in the form of current) provides its own magnetic field- this interacts with the magnetic field of the magnadur magnets, and as the wire was stationary (and remains so), pushes the magnets down (due to magnetic forces) onto the top-pan balance.

As the current increases, the strength of the magnetic field produced increases, thereby increasing the interaction, and therefore force on the magnets.

Answer 2

Good answer luwa - this is the principle of the electric motor - can I just add that the current in the wire is at right angles to the magnetic field between the poles of the magnet , the resultant force is at right angles to both of these and direction is determined using the left hand (motor) rule

Answer 3

Well if the downwards force on the balance increases then that force must come from the wire pushing it down.If the pan is pushed down then surely it's because the wire is trying to rise up.

Answer 4

that's usually incredibly of a troublesome question. The "stress" felt via the rider pushing him removed from the middle of revolution is unquestionably fictitious or "digital", on the grounds that's being perceived in an non-inertial (or accelerating) coordinate equipment. that's named centrifugal stress. The stress appearing on the rider to enhance up him/her in the direction of the middle of revolution, for this reason preserving on the experience, is named centripetal stress. So that's your answer -- the centripetal stress appearing in the direction of the middle keeps the rider on the experience. In an inertial (or non-accelerating) coordinate equipment, centrifugal stress could be considered as only the consequence of a metamorphosis in inertia of the object or rider and, as suggested above, isn't a real stress.

Answer 5

that doesn't sound right to me. the wire in the middle would not be effected. if it is copper wire. copper is not atracted to a magnet. maybe put in a steel wire. (clothes hanger) or I meant a piece of one. then see what happens. because you could reverse the polarity of batteries. if :DC and move the wire left and right at your choice. . oops if you did that you would have to attach a small magnet to the wire (clothes hanger) so that the wire would have a north and south.