Consider the following statements about thermoelectric ammeters

  1. They give correct RMS value irrespective of frequency and waveform of the input
  2. They are severely affected by stray magnetic fields
  3. They are primarily designed for current measurements at high frequencies
  4. They have low sensitivity

​Which of these are correct?

1
2, 4
2
3, 4
3
1, 3, 4
4
1, 3
5
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