Electricity and Magnetism
# Charges and Their Interactions

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

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

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

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

If a current of \(0.30\text{ A}\) flows for \(2.50\text{ min}\) in a conducting wire, approximately how many conduction electrons pass through the wire?

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

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

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

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

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

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