# physics

A charged capacitor (AB) carries on its plate A a charge Q=-1.2mC
a) What is the charge carried by plate B.
b) Is the voltage U (AB)=V (A)-V (B) positive or negative.
c) The plates A and B are connected to the terminals of a resistance R: the capacitor gets discharged.
What are the charge carriers which move in the connection wires. What is the direction of the transitional electric current

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1. a) equal and opposite

b) -charge on A, + charge on B
Vb > Va so negative

c) electrons
the electrons move through the wire from A side to B side
BUT
the current is defined as if it were positive charges moving through the wire
SO current through resistor from B side to A side

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posted by Damon

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