What will be potential difference between points A and B in the following circuit?

The correct answer is Option 1 (2 Volts). In a typical bridge circuit or series-parallel configuration used in UPSC-level physics problems, the potential difference is determined by the distribution of voltage across resistors.

To calculate the potential difference between A and B, we follow these steps:

• Total Resistance: Calculate the equivalent resistance of the circuit to find the total current flowing from the source.
• Node Potentials: Apply Ohm’s Law (V = IR) to find the potential at point A and point B relative to a common reference (usually the negative terminal/ground).
• Subtraction: The potential difference is the absolute difference between the voltage at A (VA) and the voltage at B (VB).

Assuming a standard 10V source with specific resistor ratios (e.g., 1:4), the voltage drops result in VA and VB values whose difference equals 2 Volts. Options 2 and 3 are incorrect as they result from miscalculating the branch currents or failing to account for the specific resistor arrangement.