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# Worksheet: Properties of Electric Charge

Q1:

To start a car engine, the car’s battery moves electrons through the starter motor. How many coulombs of charge are moved?

Q2:

Static electric charges are commonly measured in microcoulombs C and in nanocoulombs (nC).

How many electrons are required to produce a charge of nC?

• A electrons
• B electrons
• C electrons
• D electrons
• E electrons

How many electrons must be removed from an initially neutral object for the object to have a net charge of µC?

• A electrons
• B electrons
• C electrons
• D electrons
• E electrons

Q3:

If electrons move through a pocket calculator during a full day’s operation, how many coulombs of charge move through it?

Q4:

A copper penny with a mass of 4.8 g is given a net positive charge of C. To determine the change in the number of electrons in the penny during the charging process, use a value of 63.5 g/mol for the atomic mass of copper and a value of 29 for the atomic number of copper.

How many more protons than electrons are there in the atoms of the penny?

• A
• B
• C
• D
• E

What is the ratio of the total number of electrons in the penny before the charging process to the number of electrons removed from the penny during the charging process?

• A
• B
• C
• D
• E

Q5:

An amoeba contains protons and has a net positive charge of 0.400 pC. What is the ratio of protons to electrons in the amoeba?

• A
• B
• C
• D
• E

Q6:

In an electric storm, a lightning bolt transfers electrons between some clouds and the ground. The total charge of these electrons is 65.0 C. How many electrons are transferred?

• A
• B
• C
• D
• E