High-frequency magnetic measurements using small inductive probes

Abstract

Experiments with small magnetic probes suitable for advanced undergraduates are described. The experiments are designed to show that an inductive probe does not respond to high-frequency signals (1–70 MHz) as might be expected from experience with probes at low frequencies. Pickup of noninductive signals is demonstrated, resonances are observed, and the inductance, capacitance, resistance, and effective area of the probe are measured. In addition, the conductivity of copper and aluminum is found using thin metal foils.