(a)[3]
On Fig. 8.2, sketch the magnetic field pattern made by the current-carrying wire in the plane EFGH.
(b(i))[2]
Calculate the magnetic flux density at wire Q produced by the current in wire P.
(b(ii))[2]
Calculate the force per unit length, in $\text{N m}^{-1}$, on wire Q due to the current in wire P.
(c)[2]
The currents in wires P and Q are not equal in magnitude. State and explain whether the forces per unit length on the two wires would be different.
(i)[2]
Calculate the magnetic flux density at wire Q produced by the current in wire P.
(ii)[2]
Calculate the force per unit length, in $\text{N m}^{-1}$, on wire Q due to the current in wire P.