Question: The charge in the nucleus of an antimatter hydrogen atoms is __________.

The charge in the nucleus of an anti-hydrogen is -1, negative, antihydrogen is an anti-particle of hydrogen, hydrogen has a nucleus with a single proton likewise antihydrogen has a nucleus with a single anti-proton,  a proton is positively charged with  a magnitude of 1 whereas an antiproton therefore must be negatively charged with a magnitude of one, hydrogen contain a single proton in its nucleus likewise antimatter of hydrogen contain a single antiproton in its nucleus and therefore it must have a negative charge with a magnitude of one. therefore the charge in the nucleus of antimatter of hydrogen is negative with a magnitude of 1.

since atoms are mostly empty space explain why dont objects pass through one another

Atoms are almost empty spaces with nucleus  surrounded by cloud of electrons and, it is about 10,000 times is smaller than the atom. Object that must pass through atoms  must be something very minute or simply smaller than atoms this could only be particles like protons, neutrons, deuterons,  alpha particles, and other sub-nuclear particles,

if parallel circuit that has two resistors 18.0 ohms and 23.5 ohms find the effective resistance

parallel circuit that has two resistors 18.0 ohms and 23.5 ohms

 the effective resistance in a series circuit is given as R_effective=R₁ + R₂ +R_3, R_effective=18.0 + 23.5 =

in a series circuit what effect will adding more resistors to the circuit have

adding more resistor to a circuit in a series connection will increase the effective resistance and consequently reduce the overall  current I  the circuit.

in a parallel circuit what effect will adding more resistors to the circuit have

 adding more resistors to a parallel circuit will reduce the resistivity and increase the current in the circuit provided the resistor added are also in parallel connection.

which component is used to measure the current in a circuit

 an ammeter is used to measure in a circuit. A galvanometer can also be used but only to detect a very small amount of current.