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Our first exam is next Tuesday - Sep 27. It will cover everything I have covered in class including material covered today. There will be two review sessions Monday, Sep 26 - at 12:30 PM and at 3:00 PM in the same room as the problem solving session: FN 2.212.
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Our first exam is next Tuesday - Sep 27. It will cover everything I have covered in class including material covered today.
There will be two review sessions Monday, Sep 26 - at 12:30 PM and at 3:00 PM in the same room as the problem solving session: FN 2.212.
I have put several (37) review questions/problems on Mastering Physics. These are not for credit but for practice. I will review them at the review session Monday.
of another metal sphere (-q) of radius rb. Find potential at different points
inside and outside of the sphere.
Electric field between spheres
Potentials at different points are visualized by equipotential surfaces (just like E-field lines).
Just like topographic lines (lines of equal elevations).
E-field lines and equipotential surfaces are mutually perpendicular
Capacitor: two conductors separated by insulator and charged by opposite and equal charges (one of the conductors can be at infinity)
Used to store charge and electrostatic energy
Superposition / Linearity: Fields, potentials and potential differences, or voltages (V), are proportional to charge magnitudes (Q)
(all taken positive, V-voltage between plates)
CapacitanceC (1 Farad = 1 Coulomb / 1 Volt) is determined by pure geometry (and insulator properties)
1 Farad IS very BIG: Earth’s C < 1 mF
Energy stored in a capacitor is related to the E-field between the plates
Electric energy can be regarded as stored in the field itself.
This further suggests that E-field is the separate entity that may exist alongside charges.
Generally, we find the potential difference
Vab between conductors for a certain
Point charge potential difference ~ Q
This is generally true for all capacitances
Example: Voltage before and after