A voltmeter having a resistance of $998 \mathrm{\Omega }$ is connected to a cell of EMF$2$ $\mathrm{V}$ and internal resistance $2 \mathrm{\Omega }$. The error in the measurement of $\mathrm{emf}$ will be:

In the given circuit, the emf of the cell is $2 \mathrm{V}$ and the internal resistance is negligible. The resistance of the voltmeter is $80 \mathrm{\Omega }$. The reading of the voltmeter will be

A Galvanometer has $30$ divisions and its sensitivity is $16 \mathrm{\mu A} {\mathrm{division}}^{-1}$. It can be converted into a Voltmeter, to read $3 \mathrm{V}$, by connecting

In the circuit shown, the galvanometer shows zero current. The value of resistance $R$ is