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Maxwell bridge is used to measure
Resistance
Inductance
Capacitance
Frequency
Inductance
Quick Summary: The Maxwell bridge is a modified Wheatstone bridge used to measure an unknown inductance by comparing it with a known variable standard capacitor. It is specifically designed for inductors having a medium Q-factor (typically 1
The Maxwell bridge is a modified Wheatstone bridge used to measure an unknown inductance by comparing it with a known variable standard capacitor. It is specifically designed for inductors having a medium Q-factor (typically 1 < Q < 10).
Lx=R2R3C4 — Inductance calculation formula
Rx=R4R2R3 — Resistance of the inductor coil
Q=ωR4C4 — Quality factor of the coil
The bridge operates on the principle of null detection under AC excitation. By balancing the bridge such that the product of impedances of opposite arms is equal, the unknown inductance Lx and its series resistance Rx are determined. Since it uses a capacitor as the standard, it avoids the errors associated with stray magnetic fields and bulkiness found in variable standard inductors.
Used for medium Q-factor inductors (1 to 10).
Uses a variable standard capacitor instead of a standard inductor.
The balance equation is frequency-independent.
Not suitable for low Q coils (use Hay's bridge) or very high Q coils (use Anderson bridge).
Balance equation is independent of frequency.
Uses a standard capacitor which is more precise and compact than a standard inductor.
Not suitable for high Q coils (Q>10).
Requires a variable capacitor which can be expensive.
Industrial measurement of inductance in AC circuits.
Quality control in manufacturing of inductors.
For low Q coils (Q<1), Hay's bridge is preferred.
Option A (Resistance) is measured using Wheatstone bridge; Option C (Capacitance) is measured using Schering or De Sauty's bridge; Option D (Frequency) is measured using Wien's bridge.
B is correct — The Maxwell bridge is an AC bridge configuration primarily used to measure an unknown inductance by comparing it with a known variable capacitor.
Remember that Maxwell's bridge is for medium Q, Hay's for high Q (Q>10), and Anderson's bridge is the most precise for a wide range of Q factors.