12 Questions
What subatomic particles carry electric charges?
Protons and electrons
What happens when electric charges interact with each other?
They repel or attract each other
What is a point charge?
A charge concentrated at a single point in space
What is a test charge?
A charge used to measure the strength of an electric field
Who discovered the inverse square law for electric forces?
Charles-Augustin de Coulomb
What did Coulomb use to study the attractive and repulsive forces between charges?
A torsion balance
What is the fundamental force that governs the attraction and repulsion between electric charges?
Electrostatic force
Which statement accurately describes the direction of electric field lines?
Electric field lines point away from negative charges and towards positive charges.
In the sample problem where two charges, $q_1 = +8\mu C$ and $q_2 = -5\mu C$, are separated by $r = 10$ cm, what is the nature of the electrostatic force between them?
Attractive
If two equal charges of magnitude $1.1\times 10^{-7}$ C experience an electrostatic force of $4.2\times 10^{-4}$ N, what is the approximate distance between their centers?
0.509 m
If three charged particles are arranged in a line, with charges $q_A = -5\mu C$, $q_B = +10\mu C$, and $q_C = -12\mu C$, what is the net electrostatic force on $q_B$ due to the other two charges?
550 N
If a charge of $-70\mu C$ is observed, approximately how many electrons represent this charge?
$4.375\times 10^{14}$ electrons
Test your knowledge of electric charges, forces, and fields in General Physics 2. Explore how charged particles interact with each other, why neutral objects can be induced by charged materials, and the concepts of electric force and electric field.
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