Four forces of 170 Newtons north, 240 Newtons east, 250 Newtons south and 300 Newtons west act on a body. Determine the magnitude of the body.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

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current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete

an electric circuit