Electricity and Magnetism

Charges and Their Interactions

Electric charge

         

A nail with a mass of 17 g 17 \text{ g} is charged with 2.24×1013 C. - 2.24 \times 10^{-13} \text{ C}. How many excess electrons are in the nail?

The elementary charge is e=1.60×1019 C.e=1.60 \times 10^{-19}\text{ C}.

How many excess electrons are there on a tiny, spherical water drop of charge of 4.00×1016 C?-4.00 \times 10^{-16}\text{ C}?

The elementary charge is e=1.60×1019 C.e=1.60 \times 10^{-19}\text{ C}.

If a current of 0.30 A0.30\text{ A} flows for 2.50 min2.50\text{ min} in a conducting wire, approximately how many conduction electrons pass through the wire?

The elementary charge is e=1.60×1019 C.e=1.60 \times 10^{-19}\text{ C}.

Suppose there is a small (copper) coin with a mass of 25 g.25 \text{ g}. If we want to leave it with a charge of +1.4×107 C,+1.4 \times 10^{-7}\text{ C}, approximately how many electrons must be removed from that metal coin?

The elementary charge is e=1.60×1019 C.e=1.60 \times 10^{-19}\text{ C}.

If an average current of 0.07 A0.07\text{ A} flows from a conducting sphere for 5 sec5\text{ sec} and then stops, what can we know about the sphere?

The elementary charge is e=1.60×1019 C.e=1.60 \times 10^{-19}\text{ C}.

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