A heater contains a Nichrome wire `("resistivity "5.0 xx 10^(-7)Omega.m) ` of length 5.85 m, with an end-to-end potential difference of 112 V and with a dissipation power of 4000 W.(a) What is the wire's cross-sectional area? (b) If 100 V is used to obtain the same dissipation rate, what should the length be?

Answer

(a) `9.33 xx 10^(-7)m^(2); (b) 4.66m`