A resistance is shown in the figure. Its value and tolerance are given respectively by,

When the switch $S,$ in the circuit shown is closed, then the value of current $i$ will be 

In the given circuit the internal resistance of the $18 \mathrm{V}$ cell is negligible. If $R_1=400 \mathrm{\Omega }, R_3=100 \mathrm{\Omega }$ and $R_4=500 \mathrm{\Omega }$ and the reading of an ideal voltmeter across $R_4$ is $5 \mathrm{V},$ then the value $R_2$ will be

A carbon resistance has a following colour code. What is the value of the resistance ?

A potentiometer wire $\mathrm{AB}$ having length $L$ and resistance $12 r$ is joined to a cell $D$ of emf $\epsilon$ and internal resistance $r.$ A cell $C$ having emf $\frac{\epsilon }{2}$ and internal resistance $3 r$ is connected. The length $\mathrm{AJ}$ at which the galvanometer as shown in figure shows no deflection is

In the given circuit the cells have zero internal resistance. The currents (in Amperes) passing through resistance $R_1$ and $R_2$ respectively, are