A set of '$n$' equal resistors, of value '$R$' each, are connected in series to a battery of emf '$E$' and internal resistance '$R$'. The current drawn is $I.$ Now, if '$n$' resistors are connected in parallel to the same battery, then the current drawn becomes $10I.$ The value of '$n$' is:

A battery consists of a variable number $n$ of identical cells (having internal resistance $r$ each) which are connected in series. The terminals of the battery are short-circuited and the current $I$ is measured. Which of the graphs shows the correct relationship between $I$ and $n?$

1.		2.
3.		4.

The resistance of a wire is $R$ ohm. If it is melted and stretched to $n$ times its original length, its new resistance will be:

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:

The figure shows a circuit that contains three identical resistors with resistance $R = 9.0~\Omega$ each, two identical inductors with inductance $L = 2.0~\text{mH}$ each, and an ideal battery with emf $\varepsilon = 18~\text{V}$. The current $'i'$ through the battery just after the switch is closed will be:
  
1. $0.2~\text{A}$
2. $2~\text{A}$
3. $4~\text{A}$
4. $2~\text{mA}$

The potential difference $\left({\mathrm{V}}_{\mathrm{A}}-{\mathrm{V}}_{\mathrm{B}}\right)$ between points A and B in the given figure is if the current is flowing from A to B:

1. - 3 V                   

2. +3 V

3. +6 V                 

4. +9 V

The potential difference $V_{A}-V_{B}$ between the points ${A}$ and ${B}$ in the given figure is:
     

A filament bulb $(500~\text{W},100~\text{V})$ is to be used in a $230~\text{V}$ main supply. When a resistance$R$ is connected in series, the bulb works perfectly and consumes $500~\text{W}.$ The value of $R$ is: