Chapter Review - 18 HS Physics OpenStax

A neutral hydrogen atom has one proton and one electron. If you remove the electron, what will be the leftover sign of the charge?

• negative

• positive

• zero

• neutral

If you double the distance between two point charges, by which factor does the force between the particles change?

• 1/2

• 2

• 4

• 1/4

The combined charge of all the electrons in a dime is hundreds of thousands of coulombs. Because like charges repel, what keeps the dime from exploding?

• The dime has an equal number of protons, with positive charge.

• The dime has more protons than electrons, with positive charge.

• The dime has fewer protons than electrons, with positive charge.

• The dime is polarized, with electrons on one side and protons on the other side.

What is the magnitude of the electric field 12 cm from a charge of 1.5 nC ?

• $9.4\times10^7\ \frac{N}{C}$

• $1.1\times10^2\ \frac{N}{C}$

• $9.4\times10^2\ \frac{N}{C}$

• $9.4\times10^{-2}\ \frac{N}{C}$

A charge distribution has electric field lines pointing into it. What sign is the net charge?

• positive

• negative

• final

• neutral

Which factors determine the capacitance of a device?

• Capacitance depends only on the materials that make up the device.

• Capacitance depends on the electric field surrounding the device.

• Capacitance depends on the geometric and material parameters of the device.

• Capacitance depends only on the mass of the capacitor

The force between two charges is 4 nN . If the magnitude of one charge is reduced by a factor of two and the distance between the charges is reduced by a factor of two, what is the new force between the charges?

• 2 nN

• 4 nN

• 6 nN

• 8 nN

An atomic nucleus contains 56 protons, for iron. Which force would this nucleus apply on an electron at a distance of 10 pm?

• 0.065 mN

• 0.002 mN

• 0.13 mN

• 7.28 mN

Two plastic spheres with uniform charge repel each other with a force of 10 N . If you remove the charge from one sphere, what will be the force between the spheres?

• The force will be 15 N.

• The force will be 10 N.

• The force will be 5 N.

• The force will be zero.