Physical Final Review

How charges transfer when object is rubbed

• Physically scraping off electrons - friction

• Object losing electrons become positively charged and object gaining electrons become negatively charged

Vector nature of electric fields and electrical charges

• Electrical field lines have direction and magnitude

• Field lines point away from + towards -

• Magnetic field lines: away from north towards south

behavior of electroscope when additional charge is near

• Charged object near electroscope causes leaves to move apart - induced charges

• If electroscope is grounded while near charged object, it becomes permanently charged

Coulomb's law

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Which can move freely: conductors or insulators

• Conductors

• Insulators

6. conduction, induction, polarization

• Conduction: direct transfer of electrons by touch

• Induction: rearranging charges without touching

• Polarization: shifting electrons within atoms in insulators

7. electrical forces

• Forces between charged particles can attract or repel

• Opposites attract, likes repel

• Proton and electron

Tags

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What is the flow of electrons measured in?

• Volts

• Amps

• Ohms

• Watts

The movement of electrons is from:

• Negative to positive

• Positive to negative

• Both directions

• None of the above

Conventional current is from ______ to ______.

• + to -

• - to +

• neutral to +

• + to neutral