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 mm^{2}

(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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