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