Conceptual Physics Ch 22

The net charge of an atom equals

• the number of protons in its nucleus.
• the number of electrons surrounding its nucleus.
• zero if the atom is electrically neutral.
• always zero.

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NGSS.HS-PS2-4

If a neutral atom has 22 protons in its nucleus, the number of surrounding electrons is

• less than 22.
• 22.
• more than 22.
• sometimes any of these in a neutral atom.

A negative ion has more

• electrons than neutrons.
• electrons than protons.
• protons than electrons.
• neutrons than protons plus electrons.

According to Coulomb's law, the force between a pair of charged particles that are brought closer together

• decreases.
• increases.
• increases only if the charges are of the same sign.
• increases only if the charges are of opposite signs.

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NGSS.HS-PS2-4

When a pair of charged particles are brought twice as close to each other, the force between them becomes

• twice as strong.
• 4 times as strong.
• half as strong.
• one-quarter as strong.

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NGSS.HS-PS2-4

Unlike Newton's law of gravity, Coulomb's law involves

• force at a distance.
• a proportionality constant.
• an inverse-square law.
• repulsive as well as attractive forces.

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When you scuff electrons off a rug with your shoes, your shoes become

• negatively charged.
• positively charged.
• ionic.
• electrically neutral.

When a cloud that is negatively charged on its bottom and positively charged on its top moves over the ground below, the ground acquires

• a negative charge.
• a positive charge.
• no charge since the cloud is electrically neutral.
• an electrically grounded state.

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NGSS.HS-PS2-4

When a negatively charged balloon is placed against a wooden door, positive charges in the wall are

• attracted to the balloon.
• repelled from the balloon.
• too bound to negative charges in the door to have any effect.
• neutralized.

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NGSS.HS-PS2-4

If it takes 10 newtons of force to hold a 0.1-coulomb particle at rest in an electric field, the strength of the field there is

• 1 N/C
• 10 N/C
• 100 N/C
• 1000 N/C

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NGSS.HS-PS2-4