Mathematics · Electrical Measurements
A Campbell's bridge is used to measure an unknown inductor with series resistance Rx and self-inductance Lx by comparison with a mutual inductance M. The bridge is adjusted to balance when R1 = 100 Ω, R2 = 200 Ω, R3 = 300 Ω, and the standard mutual inductance is M = 100 mH. Using the standard balance relations for Campbell's bridge (where Rx = R3 · R2 / R1 and Lx = M · (1 + R2 / R1)), calculate Rx and Lx.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Rx = 600 Ω, Lx = 300 mH✓
- 2Rx = 200 Ω, Lx = 100 mH
- 3Rx = 100 Ω, Lx = 200 mH
- 4Rx = 150 Ω, Lx = 150 mH
Correct answer
Rx = 600 Ω, Lx = 300 mH
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