(a(i))[2]
State the condition that allows a charged particle to experience a force in a magnetic field.
(a(ii))[2]
State an expression for the magnetic force $F$ on a charged particle in a magnetic field with flux density $B$. Explain any other symbols you use.
(b(i))[1]
A conductor with rectangular faces is placed in a magnetic field, as shown in Fig. 6.1. On Fig. 6.1, shade the face that the electrons move towards because of this force.
(b(ii))[1]
The electrons’ movement in the magnetic field produces a potential difference between two faces of the conductor. Using the labels from Fig. 6.1, state the faces between which this potential difference occurs.
(c)[2]
Explain why the potential difference in (b) causes an extra force on the moving electrons in the conductor.