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  4. The resistance of a wire is 10 ohm. It is drawn in order to increase its length by 10 %.the new resistance of the wire will be

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Q. The resistance of a wire is $10 \,ohm$. It is drawn in order to increase its length by $10 \%$.the new resistance of the wire will be

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Solution:

if a wire is stretched by $n \%$, resistance increases by $2 n \%$.
therefore, if length is increased by $10 \%$, resistance increases by $20 \%$.
New resistance is $R=10 \Omega+20 \%$ of $10 \Omega=10+2=12 \Omega$.