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Q56 (CDS-I/2004) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Electricity and magnetism Answer Verified

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

Result
Your answer: —  Â·  Correct: A
Explanation

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.

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