The bridge circuit shown in the figure below is used for

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The bridge circuit shown in the figure below is used for the measurement of an unknown element Z_X. The bridge circuit is best suited when Z_X is a

1. low resistance
2. high resistance
3. low Q inductor
4. lossy capacitor

Correct Option: C

The given bridge circuit is maxwell’s bridge circuit. At balanced condition,

	R₁	=	R₂
	(jωC₁R₁1 + 1)R₄		Zx

⇒ R_x + jL_xω =	R₂R₄	[1 + jωC₁R₁]
	R₁

Separating real and imaginary parts, we get,

R_x =	R₂R₄
	R₁

or ωL_x = R₂R_{4M/sub>ωC₁
or, L_x = R₂R₄C₁
Quality factor, Q = ωL_x = ωC₁R₁
R_x

For high values of Q, large values of resistance R₁ is required, therefore for Q > 10. This bridge is not suited well and used for low values of Q.}