A copper wire of certain length has a resistance of $10 \mathrm{\Omega }$. What will be its resistance after stretching to double its length?

Two resistors of resistances $10 \mathrm{\Omega }$ and $20 \mathrm{\Omega }$ are connected in parallel. A battery supplies current of $6 \mathrm{A}$ to the combination as shown in the figure. Calculate the current in each resistor.

You are given three resistors of $1, 2, 3 \mathrm{ohms}$. Show by diagram, how can you get a resistance of $6 \mathrm{\Omega }$.

You are given three resistors of $1, 2, 3 \mathrm{ohms}$. Show by diagram, how can you get a resistance of $1.5 \mathrm{\Omega }$.

You are given three resistors of $1, 2, 3 \mathrm{ohms}$. Show by diagram, how can you get a resistance of $2.2 \mathrm{\Omega }$.

You are given three resistors of $1, 2, 3 \mathrm{ohms}$. Show by diagram, how can you get a resistance of $\frac{6}{11} \mathrm{\Omega }$.

You are given three resistors of $1, 2, 3 \mathrm{ohms}$. Show by diagram, how can you get a resistance of $\frac{11}{3} \mathrm{\Omega }$.