014) Static electricity and charge

How many electrons have been removed from a positively charged electroscope if it has a net charge of 7.5x10^-11 C?

• 7.5x10^-11 electrons

• 2.1x10^-9 electrons

• 1.2x10⁸ electrons

• 4.7x10⁸ electrons

The force exerted on a particle with a charge of 5.0x10^-9 C by a second particle that is 4 cm away is 8.4x10^-5 N. What is the charge of the second particle?

• 4.2x10^-13 C

• 2.0x10^-9 C

• 3.0x10^-9 C

• 6.0x10^-5 C

Three charges, A, B, and C, are located in a line, as shown above. What is the net force on charge B?

• 78 N toward A

• 78 N toward C

• 130 N toward A

• 210 N toward C

What is the charge on an electroscope that has

an excess of 4.8x10¹⁰ electrons?

• 3.3x10^-30 C

• 7.7x10^-9 C

• 4.8x10^-10 C

• 4.8x10¹⁰ C

Two charged bodies exert a force of 86 N on each other. If they are moved so that they are six times farther apart, what is the new force that they will exert on each other?

• 2.4 N

• 14 N

• 86 N

• 5.2x10² N

Two equally charged bodies exert a force of 90 N on each other. If one of the bodies is exchanged for a body of the same size, but three times as much charge, what is the new force that they will exert on each other?

• 10 N

• 2.7x10² N

• 30 N

• 8.1x10² N

Charging a neutral body by touching it with a charged body is called charging by _______

• conduction

• grounding

• induction

• discharging

Macy rubs a balloon with wool, giving the balloon a charge of -8.9x10^-14 C. What is the force between the balloon and a metal sphere that is charged to 25 C and is 2 km away?

• 8.9x10^-15 N

• 5.0x10^-9 N

• 2.2x10^-12 N

• 5.6x10⁴ N

An electroscope has an excess of 3.9x10⁸ electrons. What is the charge on the electroscope?

• 1.6x10^-11C

• 2.4x10^-11C

• 4.1x10^-11C

• 6.2x10^-11C

How can acquiring charge be described at a microscopic level?

• It is a process of balancing the charge on an atom.

• It is the process of removing electrons from the nucleus

• It is the process of transferring atoms

• It is the process of creating charge.