Electrostatic Field Flashcards
State Coulomb’s Law
The force of attraction or repulsion between two charges is directly proportional to the product of their charges and inversely proportional to the square of their distance apart.
Express Coulomb’s Law mathematically.
Fe = (k•q1•q2) ÷ r²
Where Fe is the force of attraction/repulsion
q1 and q2 are the respective charges
k = 1/(4πË) where Ë = 8.85 × 10¹²C²/Nm²
This implies that k = 8.99×10⁹Nm²/C²
r = distance apart
What is the mass of an electron?
9.11×10^-31 kg
What is the mass of a proton?
1.672×10^-27
What is the mass of a neutron?
1.675×10^-27
What is the charge of an electron?
-1.602×10^-19 C
What is the charge of a proton?
1.602×10^-19 C
How can charges be acquired?
- By an Ebonite (plastic) rod coming in contact with a piece of fur. (Ebonite becomes negative, fur becomes positively charged).
- By a glass rod coming in contact with a piece of silk. (The glass becomes positive, the silk becomes negative.)
How do lines of field move (from what pole to what pole)?
Lines of field move from the positive charge to the negative charge.
What is the conservative of charge?
The algebraic sum of charges in the universe is constant.
What is an electric field?
An electric field is any region of space that is under the influence of an electric force generated by a test charge placed in that region.
What is the direction of the electric field?
The direction of the electric field is the same direction as the direction of the force experienced by a positive charge.
What is electric flux?
Electric flux is the product of the electric field intensity E and the area of the region to the normal of the electric field.
Φ = EAcosθ
What is electric field intensity?
Electric field intensity of an electric field at any point is the force per unit charge it exerts on that point.
It is also the force a test positive charge experiences at that point in an electric field.
