★ Must-know
📌 Charges with the same sign repel one another, whereas charges with opposite signs attract one another.
📌 Electric charge is conserved in an isolated system and is transferred, not created, when objects are rubbed together.
Further detail
Like signs repel; unlike signs attract
1. Two small objects carry charges with the same sign. What electrical interaction do they experience?
2. When two objects are rubbed together inside an isolated system, what happens to their total electric charge?
3. Which expression describes the allowed values of electric charge, where is an integer and is the fundamental unit of charge?
What charge sign does an electron carry?
Negative.
How do two charges with the same sign interact?
They repel one another.
What equation describes the quantization of electric charge?
, where is an integer.
What is the magnitude of the fundamental charge?
What is charging by induction?
Charging an object without contact with the object that induces the charge.
What formula gives the magnitude of the force between stationary point charges?
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