If we have an unmarked magnet, how can we tell which end is the north pole of th

Question

If we have an unmarked magnet, how can we tell which end is the north pole of the magnet?

You hold a loop, like a hula hoop, horizontal outside in the vertical rain. Take water passing downward through the loop as positive water flux. As you hold the loop, the water flux is ---Select---positive with positive derivativepositive with zero derivativepositive with negative derivativezero with positive derivativezero with zero derivativezero with negative derivativenegative with positive derivativenegative with zero derivativenegative with negative derivative . You then turn the loop so that it is vertical; as you do so the water flux is ---Select---positive with positive derivativepositive with zero derivativepositive with negative derivativezero with positive derivativezero with zero derivativezero with negative derivativenegative with positive derivativenegative with zero derivativenegative with negative derivative . When the loop is vertical and still rotating, the water flux is ---Select---positive with positive derivativepositive with zero derivativepositive with negative derivativezero with positive derivativezero with zero derivativezero with negative derivativenegative with positive derivativenegative with zero derivativenegative with negative derivative .

Explanation / Answer

positiv with xero derivative

positive with negative derivative

zero with negative derivative

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