Question

In: Physics

1. At the level of the atom, both electric force and gravitational force can be evaluated...

1. At the level of the atom, both electric force and gravitational force can be evaluated for the interaction between protons and electrons. Which is dominant?

a. The gravitational force
b. The electric force
c. Both forces are approximately equal
d. Neither force is very strong at the atomic level
e. Two of the above are correct

2. A student rubs a balloon in her hair then holds the balloon against a wall and finally releases it after a moment. Which of the following is probably not going to occur?

a. The balloon will be repelled from the wall
b. The balloon will slowly slide down the wall
c. The balloon will remain in place without moving
d. All of they above
e. Two of the above are correct

3. Which of the following is scientifically verified evidence that the smallest unit of charge for an isolated particle is the same as the charge found on an electron?

a. Electrons and protons are always found in equal numbers for all systems.
b. Protons have the same magnitude of charge as electrons.
c. Charge is quantized.
d. Quarks have the same magnitude of charge as an electron.

4. During a storm, the base of a cloud acquires a large negative charge. Which, of the following is a likely result?

a. The top of a tall tree will also become negatively charged.
b. The top of a tall tree will become positively charged.
c. Electrons from the ground will attempt to move toward the cloud by way of lightning.
d. Electrons at the top of a top tree will move toward the ground.
e. Two of the above are correct.

Solutions

Expert Solution

1)

The electrostatic constant is about 1020 times larger than the gravitational constant. That's why electrostatic force is largely dominant for the subatomic particles.
Correct answer is B.

2)

Due to induction the wall will be oppositely charged and the balloon will stick to it firstly and then slowly radiate charge as the wall is connected to the ground and fall off after a short time. But there is really no chance of the balloon to be repelled by the wall, because induction doesn't create the same type of charges in two objects, and same charges repel each other. So there is no chance of repelling.

Option A is correct

3)

The amount of charge in an object is always a multiplier of a certain amount of charge. This is called the quantization of charge. And electrons happen to carry this charge which is equal to a proton's charge. As everything is made of electrons and protons then we can say that the smallest unit of charge for an isolated particle is the same as the charge found on an electron.

Option B is correct.

4)

Same as the balloon situation anything on the ground near the cloud will have induced positive charge. Positive charge is a deficiency of electrons, electrons move away to make a spot positively charged(in this case the cloud's electrons repel them from the top of the tree) and negative charge means an excess of electrons. As electrons move towards the positive potential, so charge from the clouds tries to move towards the ground. As option b and d is relevant, so,

Option E is correct.


Related Solutions

Calculate both the repulsive and gravitational force between a He atom and a B atom that...
Calculate both the repulsive and gravitational force between a He atom and a B atom that are 7x10^-15m apart from one another?
How can a force (e.g., a muscle force or a gravitational force) produce a translatory and...
How can a force (e.g., a muscle force or a gravitational force) produce a translatory and a linear force simultaneously?
Which of these statements comparing electric and gravitational forces is correct? (a) The direction of the electric force exerted by one point
Which of these statements comparing electric and gravitational forces is correct?(a) The direction of the electric force exerted by one point particle on another is always the same as the direction of the  gravitational force exerted by that particle on the other.(b) The electric and gravitational forces exerted by two particles on each other are inversely proportional to the separation of the particles.(c) The electric force exerted by one planet on another is typically stronger than the gravitational force exerted...
What is gravitational force ...
What is gravitational force ...
Write a short paragraph on what you understand by a force field. Use gravitational and electric...
Write a short paragraph on what you understand by a force field. Use gravitational and electric field concepts for your posting. (ii) How is the concept of potential used in a force field?
QUESTION 1: Are electric force and electric field vector or scalar quantities? electric force is a...
QUESTION 1: Are electric force and electric field vector or scalar quantities? electric force is a scalar electric field is a vector electric force is a vector electric field is a scalar electric force and electric field are both scalars electric force and electric field are both vectors QUESTION 2: When an electron is placed in an electric field it experiences an electrostatic force towards the North.  In what direction is the electric field? Towards the East Towards the West Towards...
Briefly explain what changing the gravitational force will do to friction on level ground.  Why does this...
Briefly explain what changing the gravitational force will do to friction on level ground.  Why does this happen?  How will this change on a hill?
what is the ratio of the sun"s gravitational farce on you to the earth's gravitational force...
what is the ratio of the sun"s gravitational farce on you to the earth's gravitational force on you?  assume you have a mass of 80 kg .
Question #1 What is the ratio of the suns gravitational force on you to the earths...
Question #1 What is the ratio of the suns gravitational force on you to the earths gravitational force on you? Please slove this by step by step and explain the steps. Thank you. Question #2 A)What is the gravitational force of the sun on the earth? B) What is the gravitational force of the moon on the earth? C) The moon's force is what percent of the suns force? Please slove this by step by step and explain the steps....
Electromagnetic and Gravitational Forces 1–Friction Force Can kinetic friction do MECHANICAL WORK? Explain. (Make sure to...
Electromagnetic and Gravitational Forces 1–Friction Force Can kinetic friction do MECHANICAL WORK? Explain. (Make sure to include the mathematical definition of mechanical work in your explanation.) Please explain in a paragraph
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT