6 Electricity and Magnetism 6.6 Sources of Magnetic Field
Magnetic field of single coils/ Biot-Savart's law with Cobra4
P2430260
Principle The magnetic field along the axis of wire loops and coils of different dimensions is measured with a teslameter (Hall probe). The relationship between the maximum field strength and the dimensions is investigated and a comparison is made between the measured and the theoretical effects of position.
For more details refer to page 123.
Magnetic field of paired coils in a Helmholtz arrangement with Cobra4
P2430362
Principle The spatial distribution of the field strength between a pair of coils in the Helmholtz arrangement is measured. The spacing at which a uniform magnetic field is produced is investigated and the superposition of the two individual fields to form the combined field of the pair of coils is demonstrated.
For more details refer to page 124.
Ferromagnetic hysteresis with Cobra4
P2430760 Principle A magnetic field is generated in a ring-shaped iron core by a continuous adjustable direct current applied to two coils. The field strength Η and the flux density B are measured and the hysteresis recorded. The remanence and the coercive field strength of two different iron cores can be compared.
For more details refer to page 145.
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