Earth's magnetic field lines up in a direction opposite of the present magnetic Feld
Reversing polarity ,changes the rotation of the device you are changing polarity on.
Reverse the polarity of the magnet.
i don't believe you can reverse the polarity on a fuse, they simply regulate the amperage of the circuit they protect,
If, by 'reverse polarity', you mean the accidental reversal of the line and neutral conductors at the socket outlet or receptacle, then the answer is no.
multiply by -1...
yes
i would never naturally assume any circuitry to be "reverse polarity" by default even if they are. since this can fry a lot of IC, and micro controllers. there are several options to adding a reverse polarity protection circuit to your project you can find three easy to implement circuits here: http://provideyourown.com/2012/reverse-polarity-protection-circuits/
Normal polarity.
we will have straight polarity and reverse polarity,we can produce the weld with good quality
no
nothing
it really doesnt