A filament lamp of $200 \mathrm{\Omega }$ resistance is used at $150 \mathrm{V}$supply. How much resistance should be joined in series with it to use it at $210 \mathrm{V}$ supply?

Calculate the equivalent resistance between points  $\mathrm{A}$ and $\mathrm{B}$ in each of the shown networks of resistors.

Calculate the equivalent resistance between points$A$ and $B$ in each of the shown networks of resistors.

Calculate the equivalent resistance between points $A$ and $B$ in each of the following networks of resistors.

Calculate the equivalent resistance between points $A$ and $B$ in each of the following networks of resistors.

Calculate the equivalent resistance between points $A$ and $B$ in each of the following networks of resistors.