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A2 Design Experiment question.. HELP!! watch

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    The question is this:

    "Design an experiment to measure the mass per unit length n of a length of copper wire. The wire will be placed in an external uniform magnetic field and I will have a variable power supply"

    Equipment:

    - set of slotted masses
    - bare copper wire
    - AC ammeter
    - variable AC power supply
    - uniform magnetic field setup
    - other equipment normally available in a lab...

    Sections:

    - Method
    - Observations (what are you going to measure?)
    - Analysis (how are you going to use what you measure?)
    - Any other good points


    Before this, we had to find an expression for the speed of a stationary wave in terms of n (mass per unit length) and T (the tension in the wire) which came out to be:

    c= squared root of (T/n)

    we then considered a conductor (with current I) in an external magnetic field... F= BIL ... if the current is alternating in the wire, the force would alternate upwards and forwards.

    If the wire is fixed at both ends, a stationary wave is formed. Hence we can measure the wavelength for the stationary wave.

    ANYONE CAN GIVE ME SOME HELP?? THANK YOU!!!
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    Adjust length so get a standing wave with Annitmode in middle and nodes at each end.

    c = f x lambda.

    f is 50 Hz if using mains based PSU. Resonance. Driving freq = natural freq of wire.

    c = your expression

    lambda / 2 = distance between 2 nodes on a standing wave.

    Should be enough there to work out n.
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    This would be a fine xperiment for our designing paper 2mrw;D
 
 
 
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