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Electrical and electronics measurements miscellaneous

Electrical and Electronics Measurements

  1. I n the Maxwell bridge as shown in the figure below, the values of resistance Rx and inductance Lx of a coil are to be calculated after balancing the bridge. The component values are shown in the figure at balance. The values of Rx and Lx will respectively be

    1. 375 ohm. 75 mH
    2. 75 ohm, 150 mH
    3. 37.5 ohm, 75 mH
    4. 75 ohm, 75 mH
Correct Option: A

Applying the usual balance condition relation,
Z1 Z4 = Z2 Z3.

we have (R1 + jL1ω)
1/R4jC4ω
R2R3
R4 + 1/jC4ω

or (R1 + jL1ω)
R4/jC4ω
R2R3
R4 + 1/jC4ω

or R1R4 + jL1ωR4 = R2R3 + jR2R3R4C4ω
∴ R1 = R2
R3
L1 = R2R3C4
R4

R1 = 2000 ×
750
= 375 ohm.
4000

Lx = 2000 × 750 × 0.05 × 10-6 = 75 mH



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