Null methods are accurate because:

  1. the galvanometer is large
  2. at balance no current flows, so the galvanometer's own resistance and calibration don't matter
  3. large currents are used
  4. they need no wires
Answer

B) at balance no current flows, so the galvanometer's own resistance and calibration don't matter

Only detects zero. SLO P-09-E-24 · Understanding

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