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A Maxwell Bridge can be used for the measurement of
High Q values
Intermediate Q values
Very low Q values
Low Q values
Very low Q values
Quick Summary: The Maxwell Bridge is an AC bridge circuit specifically designed to measure unknown inductances by comparing them with a known variable standard capacitor. It is most effective for measuring inductors with low quality factor ($Q
The Maxwell Bridge is an AC bridge circuit specifically designed to measure unknown inductances by comparing them with a known variable standard capacitor. It is most effective for measuring inductors with low quality factor (Q<10), as the bridge balance equations are independent of frequency.
Q=R1тАЛ╧ЙL1тАЛтАЛ=╧ЙR1тАЛC1тАЛ тАФ Quality factor of the inductor
LxтАЛ=R2тАЛR3тАЛC1тАЛ тАФ Unknown inductance balance equation
RxтАЛ=R1тАЛR2тАЛR3тАЛтАЛ тАФ Unknown resistance balance equation
The Maxwell Bridge employs a parallel combination of a resistor and a capacitor in one arm to balance an inductive coil in the opposite arm. Balance is achieved when the product of the impedances of the opposite arms is equal. Since the balance equations involve Q=R╧ЙLтАЛ, the bridge is balanced by varying the standard resistor and capacitor, making it suitable for coils where the resistance is significant relative to reactance.
Used for measuring inductance in the range of 1<Q<10.
Independent of frequency, which reduces errors associated with harmonic components.
The standard capacitor is used instead of a standard inductor, which is more accurate and stable.
Not suitable for high Q-factor measurements (Q>10).
Independent of frequency during balance
Uses a standard capacitor which is better than a standard inductor
Simplified bridge equations for L and R
Limited to low Q coils (1<Q<10)
Not suitable for very low Q (Q<1)
Requires a variable capacitor which can be expensive
Inductance measurement in audio frequency range
Measurement of unknown coils in medium to low Q applications
For high Q measurements (Q>10), the Hay's Bridge is preferred.
Option A is incorrect because high Q coils require Hay's Bridge.
Option C is generally considered outside the practical range, as very low Q coils exhibit significant leakage.
D is correct тАФ The Maxwell Bridge is primarily utilized for measuring coils with low quality factors (typically 1<Q<10).
Remember: Mnemonic 'Maxwell-Low' vs 'Hay-High' to instantly identify the appropriate bridge for your Q-factor requirements in competitive exams.