At what phase or phases could water exist at 4.579mm pressure and 0.0098°c?
a) solid phase
b) liquid phase
c) solid, liquid and gas phases
d) no phases are present at this point

The answer is C) solid, liquid and gas phases

Explanation:

This point is called the triple point bc solid, liquid, and gas phases can exist together.

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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.