M6 topic 1 part 1 - Charged Particles in electric fields and Magnetic Fields

Question 1

in an electric field what direction do the field lines go

Answer 1

from positive to negative (conventional current)

Question 2

what is the equation for the Force on a charged particle in an electric field

Answer 2

F= qE

Question 3

what does each symbol in the equation for the Force on a charged particle in an electric field mean and what units are they measured in

Answer 3

F=  Force on a charged particle in an electric field (Newtons(N))
q= the charge of the object experiencing the force (coulomb(C))
E= the strength of the electric field (newtons per coulomb(N/C or V/m))

Question 4

how is the strength of an electric field between parallel plates calculated

Answer 4

E = v/d

Question 5

what does each symbol in the equation for electric field strength mean and what units are they measured in

Answer 5

E = electric field strength (V/M or N/C)
V = potential difference between the two plates (volts V)
d = the distance between the plates (m)

Question 6

what is the equation for work in an electric field

Answer 6

W = qV = qEd (sub in v=Ed)

Question 7

what does each symbol mean in the work in an electric field equation and what units are they measured in

Answer 7

W= work done on the field (Joules (J))
q = charge at the point of charge (Coulombs (C))
V = electrical potential (joules per coulomb(J/C) or Volts (V))

Question 8

what is work and electric fields relationship (3)

Answer 8

• work done against an electric field increases the particle electric potential energy
• work done by the field increases the particles kinetic energy
• K = W , 1/2 mv² = qv

Question 9

what is the nature of electric fields in parallel charged plates (3)

Answer 9

• the field between charged plates is uniform
• force on a charged particle in the field is uniform
• acceleration of a particle in the electric field is uniform

Question 10

how is the force on a charged particle calculated when moving in a magnetic field

Answer 10

F =qvBsinθ

Question 11

what does each symbol mean in the force of a charged particle equation when in a magnetic field and what units are they measured in

Answer 11

F = force on the particle by the magnetic field (newtons (N))
q = charge of the particle (coulomb(C)) 
v = instantaneous velocity of the particle (m/s)
B = strength of the magnetic field (tesla (T))
θ = the angle the object is moving in the magnetic field (°)

Question 12

what is the right hand rule for the force on a particle in a magnetic field

Answer 12

(open palm)

• fingers = magnetic field lines
• thumb = direction of movement
• palm = force

Question 13

what direction do particles move in electrical fields/ magnetic fields

Answer 13

• electric fields = parabolic movement

- magnetic field = circular movement

Question 14

what is the equation that determines the radius of the circular path of a particle in a magnetic field

Answer 14

r = (mv)/(qB)

Question 15

what does each symbol mean in the radius of the circular path of a particle in a magnetic field equation mean and what units are they measured in

Answer 15

r = radius of the path (m)
m = mass of the particle (kg)
v = speed of the particle (m/s
q =the charge of the particle (coulomb (C))
B = the magnitude of the magnetic field (tesla (T))