What is the device, which depends on the action of a movalbe permanent magnet, in aligning itself in the resultant field produced by a fixed permanent magnet or current- carrying coils whose axes are displaced by a fixed angle?

What is the device, which depends on the action of a movalbe permanent magnet, in

aligning itself in the resultant field produced by a fixed permanent magnet or current-
carrying coils whose axes are displaced by a fixed angle?
by

1 Answer

Answer :

moving-magnet
instrument
by

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