Question 338: Current Electricity

Question

If a wire is stretched to make it $$0.1\% $$ longer, its resistance will:

Accepted Answer

Resistance of wire
$$R = {{ho l} \over A} = {{ho {l^2}} \over C}$$ (where $$Al=C$$ )
$$	herefore$$ Fractional charge in resistance
$${{\Delta R} \over R} = 2{{\Delta l} \over l}$$
$$	herefore$$ Resistance will increase by $$0.2\% $$

Answer

increase by $$0.2\% $$

Answer

decrease by $$0.2\% $$

Answer

decrease by $$0.05\% $$

Answer

increase by $$0.05\% $$

Current Electricity

If a wire is stretched to make it $0.1\% $ longer, its resistance will:

Choose the correct answer: