All Flashcards
What is Coulomb's Law?
The force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them: F = k rac{|q_1 q_2|}{r^2}
Define charging by friction.
Rubbing two neutral objects together, transferring electrons. One object becomes positively charged, the other negatively charged.
Define charging by contact.
A charged object touches a neutral object, transferring some charge. Both objects end up with the same type of charge.
Define charging by induction.
Bringing a charged object near a neutral object, causing charge separation (polarization). If grounded, the neutral object acquires the opposite charge.
What is 'k' in Coulomb's Law?
'k' is Coulomb's constant, approximately
What are the key differences between charging by contact and charging by induction?
Contact: Requires physical touch, results in the same charge. | Induction: No physical touch needed, results in opposite charge (if grounded).
Compare temporary and permanent induction.
Temporary Induction: No grounding wire, like charges move away, opposite charges move towards. | Permanent Induction: Grounding wire, like charges leave the neutral object.
Compare the final charge states after charging by friction vs. charging by contact.
Friction: Two oppositely charged objects. | Contact: Both objects have the same charge.
Compare the movement of charges in conductors and insulators.
Conductors: Charges move freely. | Insulators: Charges do not move freely.
Compare the effect of distance on electrostatic force vs. gravitational force.
Electrostatic Force: Inversely proportional to the square of the distance. | Gravitational Force: Inversely proportional to the square of the distance.
Label the diagram of charging by induction (grounded).
1: Charged Object, 2: Neutral Object, 3: Induced Negative Charge, 4: Ground Connection, 5: Flow of Electrons