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Which of the following is true about the two charged vanes that produce electric field in Paramagnetic oxygen analyzer?

Which of the following is true about the two charged vanes that produce electric field in Paramagnetic oxygen analyzer? Correct Answer One vane should be at higher potential than the test body and the other vane should be at lower potential

In Paramagnetic oxygen analyzer, the two charged vanes should be such that one vane should be at higher potential than the test body and the other vane should be at lower potential. This electric field produces a force.

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