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Solved physics Paper 5??

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why do we need AC power sources at some places and DC power sources for the others??
Apart from that when do we need to use EHT and when we should not use it. I mean in one resistivity question (the glass one) we had to use EHT and at another resistivity question (aluminium one) we didnot had to use EHT. Why is that so?
 
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When we plot points on the graph, is it necessary to draw a circle around each plotted point? Please can someone tell me!
 
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