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    • Thread Starter

    Hi guys.

    I am doing an experiment measuring the magnetic flux density of a magnetic field by putting a clamped current carrying wire in a magnetic field, where the magnets are on a top pan balance.

    I will vary the current and record the mass shown on the balance. Using f=mg i will use this as the force and plot a graph of force against current.

    I am trying to explain why the magnets move downwards with a force that is equal and opposite to the force that acts on the wire.

    Can anyone read the last paragraph and tell me if it makes sense and if there is anything missing that i should think about adding.

    Appreciate the time.
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    It's Newton's 3rd Law.

    If the magnetic field exerts a force on the wire, then the wire (or the field around it) exerts an equal and opposite force on the magnetic field or the magnet which is producing it. This force is what you're measuring on the balance.
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