Measurement bridges — match each bridge with the primary quantity it measures (or is best suited for). List I (Bridge) A. Anderson Bridge B. Kelvin Bridge C. Schering Bridge D. Wheatstone Bridge List II (Primary use) 1. Low resistance measurement 2. Medium resistance measurement 3. Inductance measurement 4. Capacitance and dielectric loss measurement

Introduction:
This matching problem checks core instrumentation knowledge: which classical AC/DC bridges are best suited to measure inductance, capacitance, and different ranges of resistance. These associations are standard in electrical measurements and metrology.

Given Data / Assumptions:

• A: Anderson Bridge is a derivative of Maxwell bridges focused on inductance measurement.
• B: Kelvin (Kelvin Double) Bridge eliminates lead/contact errors to measure very low resistances.
• C: Schering Bridge targets capacitance and dielectric loss (insulation testing).
• D: Wheatstone Bridge is the general-purpose DC bridge for medium resistances.

Concept / Approach:

Each bridge exploits balance conditions that isolate the desired unknown. For inductors, bridges compare inductive reactance with known resistive/capacitive elements. For very small resistances, four-terminal (Kelvin) connections bypass lead resistance. For capacitors and dielectrics, Schering uses a lossless standard capacitor and a resistive-capacitive arm to separate capacitance from loss angle. The Wheatstone bridge relies on ratio arms for accurate medium-resistance measurement.

Step-by-Step Solution:

Verification / Alternative check:

Textbook tables of bridges list these canonical uses; laboratory practice confirms that each bridge's topology is optimized for the stated quantity.

Why Other Options Are Wrong:

• Any mapping assigning Kelvin to medium or high resistance ignores its four-terminal low-ohm advantage.
• Placing Anderson with capacitance or Schering with inductance interchanges distinct AC bridge purposes.
• Using Wheatstone for very low resistances neglects lead/contact error issues solved by Kelvin.

Common Pitfalls:

Confusing Maxwell/Anderson variants; remembering that Anderson is specifically tuned for inductance helps. Also, do not assume Wheatstone suits all resistance ranges equally.

Final Answer:

A-3, B-1, C-4, D-2