EMAGS

How many times greater is the mass of the proton over the mass of electron?

• 1836

• 0.9986

• 1838

• 1.0014

Suppose there is an atom of oxygen, containing eight protons and eight neutrons in the nucleus, and two neutrons are added to the nucleus. The resulting atomic weight is about:

• 12

• 10

• 16

• 18

Which of the following shells contain 18 electrons?

• L

• N

• M

• K

In materials, what do you call the region that separates the valence and conduction bands

• Energy gap

• Forbidden band

• Insulation band

• Energy gap or forbidden band

Determine the force in Newton between two 4 uC charges by 0.1 meter in air.

• 1.44 N

• 144 N

• 14.4 N

• 1440 N

Find the electric field intensity 10 cm form a charge Q = 5 nC

• 450 N/C

• 900 N/C

• 4.5 kN/C

• 900 kN/C

What is the static charge that can be stored by your body as you walk across a carpet?

• 300 volts

• 30,000 volts

• 3,000 volts

• Over 30,000 volts

A wire carries 6.2414 x 10^18 electrons per second. The current in amperes is:

• 1 A

• 0.5 A

• 2 A

• 0.25 A

A 2 nC point charge will produce what potential at 2 m away?

• 4 volts

• 7.5 volts

• 6 volts

• 9 volts

When a 12.0 V car battery runs a single 30.0 W headlight, how many electrons pass through it each second?

• 1.56x10^19 electrons

• 1.65x10^19 electrons

• 1.56x10^18 electrons

• 1.65x10^18 electrons