Exam (elaborations)
PHYS-143 Week 1 Questions And Answers Latest Update
- Course
- PHYS 143
- Institution
- University Of Illinois - Urbana-Champaign
PHYS-143 Week 1 Questions And Answers Latest Update
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PHYS-143 Week 1 Questions AndAnswers Latest Update
How many charges are there? ANS✔✔ 2; positive and negative. (Q)
represents a total charge and (q) represents an individual charge
Can charges be quantified in any numeric value? ANS✔✔ No, it is quantized
in terms of (e): magnitude of electron charge (1.6e-16) Coulumb
What is the SI unit of charge? ANS✔✔ Coulomb, C
Net Charge Equation (Qnet) ANS✔✔ Qnet = Npe - Nne (where Npe is # of
positive charges and Nne is # of negative charge)
Atoms and Ions, what is neutral and what is not? ANS✔✔ Atoms are
definitively neutral, Ions always have a net (+) or net (-) charge due to losing
or gaining electrons.
What is a Conductor? ANS✔✔ Electrons and similar charges are free to
move spatially, protons do NOT move (e.g. copper)
What is an insulator? ANS✔✔ Charges do NOT move around freely (e.g.
wood, rubber, glass)
Can charges transfer from physical contact? ANS✔✔ Yes, this is called
charging by conduction
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