Maintaining a potential difference, Physics

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Maintaining a potential difference

A heating element is made by maintaining a potential difference of 68.0 V across the length of a Nichrome wire that has a 3.01 × 10^-6 m² cross section. Nichrome has a resistivity of 5.00 × 10^-6 ?

(a) If the element dissipates 2040 W, what is its length?

(b) If 106 V is used to obtain the same dissipation rate, what should the length be?

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Physics: Maintaining a potential difference

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