A wire of resistance $R$ is cut into $n$ equal parts. These parts are then connected in parallel. The equivalent resistance of the combination will be

Which of the following equations is Kirchhoff's first rule as applied to the circuit given below?

Which of the following is not a correct equation by Kirchhoff's second law for the above circuit?

What is the value of $I_1$ in the above circuit?

In each of the following circuits, what is the equivalent resistance between $A$ and $B$ ? All resistors have same value $i . e ., R$.

(A) 

(B) 

(C) 

(D) 

(E) 

The effective resistance between points $P$ and $Q$ of the electrical circuit shown in the figure is: