Resistivity, Resistance, and Ohm\'s Law AP Physics 2 We previously argued that t
ID: 2269237 • Letter: R
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Resistivity, Resistance, and Ohm's Law AP Physics 2 We previously argued that the electric field inside of any charged conductor is zero, yet in order to have an electric current through a wire there must be a nonzero electric field within the wire. How can this be? Explain. 1. A current of 1.00 A flows in a wire. How many electrons are flowing past any point in the wire per second? 2. There exists a complete circuit with a battery, a wire, and a resistor. (a) Explain why it is necessary for the circuit to be complete (connected without breaks) for there to be a nonzero current. (b) What is the job of the battery in this circuit? (c) What happens to the electrical potential energy of the charge as it flows into the resistor? (d) Explain the point of adding a resistor to a circuit. 3- 4. Why does the resistivity of a material typically increase with temperature? 5, what voltage will produce 0.25 A of current through a 3000 resistor?Explanation / Answer
1. There are a lot of free electrons (charges) in a conductor. In a typical electrostatic case, the electrons in a conductor try to rearrange themselves to cancel the electric field inside the conductor. Finally, the electric field inside the conductor becomes zero and charges do not move after that.
In case of an electric wire, there is one or more source of EMF attached to it. It causes a potential difference across a conductor followed by an electric field inside the conductor. Thus electrostatic equilibrium is disturbed and electrons flow under applied filed giving finite amount of current in it.
The source EMF takes the charges from one end of the wire to the other end and does the work done. That is why the battery gets drained after conducting current for a while.
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