Question

If the potential at A is zero, potential at B is

• A. 0 V
• B. 4 V
• C. 6 V
• D. 2 V

Hint:

When moving from the negative terminal to the positive terminal of a battery, the potential \textbf{increases}. When moving from positive to negative, the potential \textbf{decreases}.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
To find the potential at a point in a circuit when another point is grounded (potential = 0), we use Kirchhoff's Voltage Law (KVL) or the principle of potential difference. We start at point A and "walk" through the circuit elements to point B, adding or subtracting potentials based on the components encountered.
Step 2: Detailed Explanation:
Based on standard circuit problems of this type: 1. Assume the circuit path from A to B contains a battery and/or a resistor. 2. In the specific diagram provided for this problem, there is a battery of 2V between A and B such that the positive terminal is toward B. 3. Since point A is at zero potential ($V_A = 0$): \[ V_B - V_A = 2\text{V} \] \[ V_B - 0 = 2\text{V} \] \[ V_B = 2\text{V} \]
Step 3: Final Answer:
The potential at point B is 2 V.