Part Four - Electrostatics Flashcards
When comparing mass and size data for the planets Earth and Jupiter, it is observed that Jupiter is about 300 times more massive than Earth. One might quickly conclude that an object on the surface of Jupiter would weigh 300 times more than on the surface of the Earth. For instance, one might expect a person who weighs 500 N on Earth would weigh 150000 N on the surface of Jupiter. Yet this is not the case. In fact, a 500-N person on Earth weighs about 1500 N on the surface of Jupiter. Explain how this can be.
The affect of the greater mass of Jupiter is partly offset by the fact that the radius of Jupiter is larger. An object on Jupiter’s surface is 10 times farther from Jupiter’s center than it would be if on Earth’s surface. So the 300-fold increase in force (due to the greater mass) must be divided by 100 since the separation distance is 10 times greater.
What is the practically infinite reservoir for electric charge?
The Earth
Lightning occurs by:
Clouds releasing electrons to the earth to become balanced.
Electrons “flow” from…
…negative to positive.
How is electric charge transferred?
Friction, conduction, induction/polarization
What causes an object to become electrically charged?
Unequal numbers of electrons and protons.
q1 = +3.5 x 10^-8 C, q2 = -2.9 x 10^-8 C, d = 0.65 m. Calculate electrical force of attraction - use Coulomb’s Law.
2.16 x 10^-5 N, attractive
-q1 and +q2= 6.0 x 10^-7 C, d = 0.50 m. Calculate electrical force of attraction - use Coulomb’s Law.
1.3 x 10^-2 N, attractive
The larger the magnitude of charge of objects, the _____ the resulting force is between them. (attractive or repellant)
Larger
The less the magnitude of charge of objects, the _____ the resulting force is between them. (attractive or repellant)
Smaller
The further away charged objects are, the _____ the resulting force is between them. (attractive or repellant)
Less
The closer charged objects are, the _____ the resulting force is between them. (attractive or repellant)
Greater
