A heating element is made by maintaining a potential difference of 79. 0 V across the length of a Nichrome wire that has a 4. 11×10−m² cross section. Nichrome has a resistivity of 5. 00×10−⁷ Ω⋅m. (a) If the element dissipates 7250 W, what is its length? (b) if 104 V is used to obtain the same dissipation rate, what should the length be? (a) Number Units (b) Number Units