In the circuit shown below, if a conducting wire is connected between points \(A\) and \(B\), the current in this wire will: (All resistances are given in ohms)
         

1.	flow from \(A\) to \(B\)
2.	flow in the direction which will be decided by the value of \(V\)
3.	be zero
4.	flow from \(B\) to \(A\)

Two cells having the same emf, are connected in series through an external resistance R. Cells have internal resistance r₁ and r₂ respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is:

1. $r_1-r_2$

2. $\frac{r_1+r_2}{2}$

3. $\frac{r_1-r_2}{2}$

4. $r_1+r_2$

The power dissipated across the \(8~\Omega\) resistor in the circuit shown here is \(2~\text{W}\). The power dissipated in watts across the \(3~\Omega\) resistor is:
       

Kirchhoff’s first and second laws for electrical circuits are consequences of:

In the circuits shown below, the readings of the voltmeters and the ammeters will be:

Which of the following acts as a circuit protection device?

Three resistances \(\mathrm P\), \(\mathrm Q\), and \(\mathrm R\), each of \(2~\Omega\) and an unknown resistance \(\mathrm{S}\) form the four arms of a Wheatstone bridge circuit. When the resistance of \(6~\Omega\) is connected in parallel to \(\mathrm{S}\), the bridge gets balanced. What is the value of \(\mathrm{S}\)?

The total power dissipated in watts in the circuit shown below is:

A current of \(3~\text{A}\) flows through the \(2~\Omega\) resistor shown in the circuit. The power dissipated in the \(5~\Omega\) resistor is: