Which group explored the north atlantic ocean near their homeland between 700 ce and 1100 ce?

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

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