What is the “cosmic haystack problem”? list as many of its components as you can think of.

About the universe, The problem isn't just that the sky has billions of stars to search but there are also billions of frequencies.

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.

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