Answer :

(a) Let R be the resistance of the coil.


Given, resistivity, ρ = 1.0 × 10–8 Ω m


The power P consumed by a coil of resistance R when connected across a supply V is given by Joule’s heating effect-






(b) We know resistance R is given by-



where


ρ = resistivity of the material


l = length of the wire


A= area of cross section of the wire


Given, cross-sectional area of the wire is 0.5 mm2





(c) Let n be the number of turns in the given coil.


Given, radius of each turn is 4.0 mm


Then,



Where,


l = length of the coil


r=radius of the coil





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