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  • EE-507 Current Balance Experiments

    Possible Experiments
    • Measurement of the Lorentz force affecting current carrying wire in magnetic field
    • The effect of conductor length on Lorentz force
    • The interaction of current carrying coils with external magnetic fields
    • The variation of the Lorentz force with the angle between wire and magnetic field
    Standard Equipment

    A holder platform, 1 DC current source, 1 weight balance, multimeter, 1 magnetic apparatus, wire set, 1 angle adjustable coil, cables.

    Technical Information:

    The force affecting a moving charge is known as Lorentz force and given by: F=qVxB. Here V is velocity, B is the magnetic field. In this set the magnetic field is created by permanent magnets. The magnitude of this force is given by: F = qVBSin(a) where a is the angle between magnetic field and current direction. Ifd a charge moves a distance of dx within a time interval of dt, then the velocity and current are given by: V=dx/dt and I=dq/dt. Using these definition lorentz force can be written as:F=I LxB. This is called Biot-Savart law. Here vector L denotes the length of the wire with a direction of current flow. Considering the angle a between this direction and the magnetic field tion, the magnitude of this force becomes: F=ILBSin(a). This equation depends on the magnitude of current, length of wire, the strength of magnetic field and this angle. The experiment set is designed such that the Lorentz force is against gravitational force which increases or reduces the weight of the magnetic apparatus.