Electrostatic Induced Voltage Generated on Two Metal Boxes by a Nearby Charged Body

Abstract

Electrostatics is used in electronic equipment and becomes occasionally a source of a malfunction or failure of the equipment. When a charged body such as a charged human body moves near ungrounded metal boxes of electronic equipment, the induced voltages of the metal boxes are changed. In this study, the induced voltages generated on two ungrounded metal boxes are experimentally measured. The results show that the values of the induced voltages of the two metal boxes are -2.2 times that of a moving charged body. The electrostatic energies for the distance D of more than 50cm between the two metal boxes are less than 50% of the energies for the distance D of 1cm. The mode of the induced voltages changes as the distance D between the two metal boxes increases. The results will be useful in considering an arrangement of the electronic equipment and the preventive measures for the electronic equipment.