A permanent magnet moving coil type ammeter and a moving iron type ammeter is connected in series with the output of a half wave rectifier. If the moving iron type instrument reads 5-ampere magnet moving coil type instrument is likely to be
Using the given formula for the DC output current of a half-wave rectifier with a root mean square (RMS) output current of 5 A:
IDC = 2 × IRMS / π
IDC = (2 × 5 A) / π
IDC ≈ 3.18 A
Therefore, the permanent magnet moving coil type ammeter would likely read 3.18 A.