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# PHYS1002 S2 2010 Problem Sheet 7 Due: 5pm Friday 17th September Use the Model, Visualize, Solve and Assess pattern as described in the text. Consider...

Hello,
I am reattaching my homework, as it seems that for some reason it didn't go through, if it did, then please ignore this homework help, but also please try and give me the answers as soon as you can, I need them in max 4-5 more hours. Answer the first 3 questions (all parts in Q 1,2 and 3) with thorough explanation of the steps you've used ( as you usually do ).
Thanks, and please respond as soon as you can, I can see that your time is currently 11:41AM, unfortunatley though I can only select Friday, so please answer me as soon as you can ( in 4-5 hours max from now prefferebly) .
Thanks again

PHYS1002 S2 2010 Problem Sheet 7 Due: 5pm Friday 17th September Use the Model, Visualize, Solve and Assess pattern as described in the text. Fill in and attach a cover sheet to the front of your solutions Submit your individual solutions to the three problems to the tutorial slot in the Physics Annexe (outside room 6-320). 1. Consider the simple circuit below. Leaving the positive terminal of the battery is the copper wire A with a diameter of 1.0mm. As shown, wire A is connected to wire B which is also copper but has a diameter of 3.0mm. Wire B is connected to the resistor via wire C which has a diameter of 1.0mm and is made of gold. The resistance of the combination of wires is still negligible. a. What is the current in the circuit? Is it the same everywhere? b. Find the current densities for wires A, B and C. c. Find the drift velocity of the charged particles in wires A, B and C. d. What is the electric field in each section of wire?
PHYS1002 S2 2010 2. A real battery can be modelled as an ideal battery in series with a small ʻ internal resistance ʼ , as shown in the circuit diagram, where the internal resistance is r = 1 Ω . a) Using Kirchoff ʼ s loop law, determine the potential difference across each component and draw a graph of the potential as a function of distance travelled (clockwise) through the circuit. By how much does the voltage of the real battery differ from that of the ideal? b) Determine the power ʻ wasted ʼ in the internal resistance of the battery. If the battery were hooked up to a load resistance that was significantly smaller than the 10 Ω and 20 Ω resistors shown here, would the rate of heat generation inside the battery increase or decrease? 3. A very long wire, carrying current I = 1A, is bent in the middle to make a sharp right- angle bend. If the wire is oriented so that its arms lie along the positive x and y axes, with the current coming in along the x-axis, what is the magnetic field strength and direction at the point ( x , y ) = (1cm, 1cm) ?
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## This question was asked on Sep 16, 2010 and answered on Sep 16, 2010.

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