Kirchhoff's junction rule is a reflection of:

a.	conservation of the current density vector
b.	conservation of charge
c.	the fact that the momentum with which a charged particle approaches a junction is unchanged (as a vector) as the charged particle leaves the junction
d.	the fact that there is no accumulation of charges at a junction

Which of the above statements are correct?
1. b and c
2. a and c
3. b and d
4. c and d

For the circuit shown in the figure, the current \(I\) will be:

1. \(0.75~\text{A}\)
2. \(1~\text{A}\) 
3. \(1.5~\text{A}\)
4. \(0.5~\text{A}\)

Two solid conductors are made up of the same material and have the same length and the same resistance. One of them has a circular cross-section of area $A_1$ and the other one has a square cross-section of area $A_2$. The ratio $A_1/A_2$ is:

For the circuit given below, Kirchhoff's loop rule for the loop \(BCDEB\) is given by the equation:

The equivalent resistance between \(A\) and \(B\) for the mesh shown in the figure is:

A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed doubles if:

A cell having an emf \(\varepsilon\) and internal resistance \(r\) is connected across a variable external resistance \(R\). As the resistance \(R\) is increased, the plot of potential difference \(V\) across \(R\) is given by:

1.		2.
3.		4.

In the circuit shown in the figure below, if the potential at point \(\mathrm{A}\) is taken to be zero, the potential at point \(\mathrm{B}\) will be:

1. \(+1\) V
2. \(-1\) V
3. \(+2\) V
4. \(-2\) V

Twelve wires of equal resistance R are connected to form a cube. The effective resistance between two diagonal ends A and E will be:

1. $\frac{5\mathrm{R}}{6}$

2. $\frac{6\mathrm{R}}{5}$

3. $12\mathrm{R}$

4. $3\mathrm{R}$

The net resistance of the circuit between \(A\) and \(B\) is: