CBSE Class 10 Answered
Two wires off equal lengths,one of copper and other of magnesium have the same thickness .which one can be used for (i)electrical transmission lines (ii)electrical heating device .why ?
Asked by yash Shah | 16 May, 2013, 03:08: PM
Expert Answer
To make electrical transmission lines, we want to use a material which will give lower resistivity, so that there is smaller loss of energy during transmission, while for the electrical heating device, we need to use a material which has a high resistance so that a greater heat energy is released.
Heat energy = V^2t/R and R is directly proportional to resistivity as the length and the thickness is constant.
Copper has smaller resistivity (17.2n ohm-m) as compared to magnesium (43.9 n ohm-m) and hence would produce higher heat energy. So, copper can be used to make electrical heating device while magnesium can be used to make electrical transmission lines.
Answered by | 16 May, 2013, 10:03: PM
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