Wigton Physics Current Balance Plotting a graph of current against force as measured by the balance will show that the two are proportional. this is why it is called a current balance: every force reading can be converted into a current. In this experiment you will use a current balance in which the upper conductor is free to pivot on knife edges. the upper conductor is balanced so that the wires are a small distance apart.
Wigton Physics Current Balance The current balance is used to measure the force of repulsion between identical, oppositely directed, currents in parallel conductors. this shows a direct link between the mechanical forces of newton and the electromagnetic forces of ampere and maxwell. In this experiment you will verify that the force between two wires is proportional to the product of the currents, and estimate the proportionality constant involved. This instrument is an example of a centi ampere balance. the high current terminals are at the back of the balance. the beam balance mechanism consists of two rings connected to each end of the beam, with their planes horizontal to the beam. each of the rings is free to move between a set of coils. The magnitude and direction of this force depend on four variables: the magnitude of the current (i); the length of the wire (l); the strength of the magnetic field (b); and the angle between the field and the wire (Ө).
14 2 3 Current Balance Xmphysics This instrument is an example of a centi ampere balance. the high current terminals are at the back of the balance. the beam balance mechanism consists of two rings connected to each end of the beam, with their planes horizontal to the beam. each of the rings is free to move between a set of coils. The magnitude and direction of this force depend on four variables: the magnitude of the current (i); the length of the wire (l); the strength of the magnetic field (b); and the angle between the field and the wire (Ө). When a current passes through a coil of wire, the coil of wire behaves like a magnet. the magnet attached to the straw is then attracted towards the coil, and the straw becomes tilted. the force between the two magnets can then be balanced by putting a counterweight on the other end of the straw. In this part of the experiment you will vary current (i) in a current loop of fix length (l) and find the relationship between the current and the magnetic force (fb). In a current balance, the conductors form part of an arm of a sensitive balance and the force between them, when they carry a current, is counterbalanced by a weight m added to the other arm. To determine how the force on a current carrying wire depends on its length, the strength of the magnetic field, and the magnitude of the current flowing in the wire, and to display the relationships graphically.
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