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卡片预览 (11 张)
What phenomenon occurs when a vertical-swinging compass points at the angle flux lines enter the earth?
Inclination (magnetic dip)
What is a line connecting points of equal inclination?
Isoclinic line
What is the angle of inclination at either of the magnetic poles?
90 degrees
What is the name for the isoclinic line where the angle of inclination is 0 degrees?
Magnetic equator
What general device is designed to produce static electricity?
Electrostatic generator
What is the most common type of high-voltage electrostatic generator in use today?
Van de Graaff Generator
To what part of a charged object does electric charge always move?
The outside
Where is electric charge most concentrated on a charged object?
At a corner or a point
What is the large discharge of static electricity between the ground and a cloud?
Lightning
What device protects structures from lightning by directing the charge away from building materials?
Lightning rod
What eerie blue glow appears around pointed objects during storms due to electrostatic discharge?
St. Elmo’s fire (corona discharge)