Question

In the circuit shown in figure the direction of current flowing through resistance $2R$ is:

• A. From left to right
• B. From right to left
• C. None of these
• D. Zero

Answer 1

The correct option is B From right to left

The points lying on same conducting wire will be at same potential.
Thus marking the points having same potential and redrawing the circuit will yield a simpler circuit.


This circuit can be redrawn as:


All the resistances are in parallel combination. Since current flows from the positive terminal of the battery to its negative terminal. So, current will flow from $A$ to $B$ in all the three resistors.

The flow of current can be represented in the original circuit as shown below:


So, the direction of current flowing through $2R$ resistor is from right to left.

Why this question? $\underset{–}{\text{Key concept}}$: Application of point potential technique in simplifying a circuit.