29. The heater is made of wire length l1, and a diamete

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29. The heater is made of wire length l1, and a diameter d1 calculated voltage U1. What you need to take the length and thickness of the wires to the heater with a voltage U2 demanded the same power? Heat the wire is proportional to its surface.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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