THE CONSTRUCTION OF DEMONSTRATION LABORATORY KIT FOR MEASURING THE MAGNETIC FIELD BY SMARTPHONE APPLICATION: A CASE OF STRAIGHT ELECTRICAL WIRE

Abstract

This study aimed to develop a demonstration laboratory kit for studying magnetic fields based on Ampere’s Law and to evaluate its effectiveness. The research was divided into two parts: measuring the magnetic field of a current-carrying straight wire and assessing AC current in electrical equipment. In the first part, magnetic fields were recorded at multiple distances across five circuit configurations, with resistors arranged in series and parallel. Measurements were conducted from 1 cm to 8 cm on both sides of the wire, with the calculated magnetic permeability deviating by less than 10% from standard values, confirming high accuracy. In the second part, magnetic fields were measured at close distances (1 cm and 2 cm from the wire) in circuits connected to an electrical appliance across four configurations, yielding consistent results. The average current ranged from 0.370 A to 1.730 A, with multimeter and clamp meter readings showing percentage errors between 1.42% and 5.83%, indicating satisfactory consistency. These findings affirm the kit’s potential as an accessible prototype for physics laboratories.

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