Q. 4
A heater coil is
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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