22 Questions
What happens when a rubber rod is brought near another rubber rod?
The two rods will repel each other.
When a glass rod is rubbed with silk, what happens to the charge on the glass rod?
The glass rod gains a positive charge.
What is the relationship between the charge on the silk and the charge on the glass rod after rubbing?
The charges are equal and opposite.
Which of the following statements about electric charge is true?
Electric charge is conserved in an isolated system.
How many electrons constitute one coulomb of electric charge?
6.24 x 10^18 electrons
What is the purpose of the text provided?
To explain the concept of electric charge and its properties.
What is the standard symbol used for electric charge as a variable?
q
How many electrons contribute to a charge of 1 Coulomb?
6.25 x 10^10 electrons
What type of charge does an electron carry?
Negative
In the Van de Graaff generator, where is a large amount of charge built up?
On the metal dome
Which part of the Van de Graaff generator usually holds positive charges?
Metal dome
What happens when the charged dome of a Van de Graaff is connected to the earth via a microammeter?
The microammeter reads zero current
What does the deflection of the pointer of the meter indicate?
An electric current flow between the metal dome and the Earth
What happens when a discharging metal sphere is brought closer to the charged dome?
Sparkling occurs and an electric current flows
Why do the hairs of a student stand upright when brought near the charged dome?
The hairs receive positive charges from the dome and the same charges repel each other upwards
Which of the following is NOT an example of a non-contact force?
Normal force
What is the relationship between the electric force on q1 and the electric force on q2 according to Newton's Third Law?
The forces are equal in magnitude and opposite in direction
What does Coulomb's Law state about the relationship between the electric force and the distance between charges?
The force is inversely proportional to the square of the distance
What is the value of Coulomb's constant, $k$, in Coulomb's Law?
$k = 8.9876 \times 10^9 , \text{N,m}^2/\text{C}^2$
What is the direction of the electric force on the electron in a hydrogen atom exerted by the proton in the nucleus?
The force is directed towards the proton
What is the permittivity of free space, $\text{ extepsilon}_0$, used in Coulomb's Law?
$\text{ extepsilon}_0 = 8.8542 \times 10^{-12} , \text{C}^2/\text{N,m}^2$
How does the electric force between two like charges change as the distance between them increases?
The force decreases with the square of the distance
Learn about the calculation of electric charge using the equation q = Ne and the generation of electric charges in devices. Understand how charge is quantized and the fundamental unit of charge. Explore the concept of electron and proton charges with practical examples.
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