# Finally we plan to orient the search coil at specific

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Finally, we plan to orient the search coil at specific angles with respect to the longitudinal axis, to measure the change in magnetic flux. Because Φ, the flux, is defined as B · A over the entire area, we expect an cos θ relationship with the angle with respect to the longitudinal axis. This entire process will be repeated for the set of Helmholtz coils, to measure how a set of paired coils affects a map of the magnetic field strength. In addition, as we expect a fairly uniform magnetic field for a large region of the Helmholtz coils, we can calculate the volume in which there is a uniform magnetic field, from our mapping. 2 Methodology We are hooking up a set of Helmholtz coils to an 60Hz wall socket, after reducing the voltage through a step down transformer to 0.5 volts. The transformer has two outputs; one set leads to channel A of an oscilloscope, to measure the waveform of the current, and the other leads to the Helmholtz coils, after passing through an ammeter. The Helmholtz coils have 60 turns each and an inner diameter of 11.75 cm. Our search coil is hooked up to our oscilloscope in channel B, in order to compare the waveforms. It has a cross-sectional area of 1 sq. centimeter and has 20 turns. In order to generate the field for a single coil, we short-circuited the circuit with the Helmholtz

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• Winter '13
• MarceloGleiser
• Physics, Magnetic Field, ε, magnetic field strength, Magnetic Field Mapping

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