Electric fields Flashcards
1
Q
Define
electric field strength
A
The force per unit positive charge acting on a stationary positive charge at that point
2
Q
How do you calculate electric field strength?
A
p.d. across plates / plate separation
E = V/d
E = F/Q
(measured in V m-1 or N C-1)
3
Q
How do you calculate the force on a charge in a uniform electric field?
A
F = QE = QV/d = eV/d
4
Q
An electron travels between two plates in a uniform electric field and reaches the opposite plate at v m s-1
How will this speed change if the uniformity of the field is changed?
A
The speed will not change as the speed only depends on the potential difference across the plates.
