Two long straight parallel wires P and Q carry currents into the plane of the paper, as shown in Fig. 8.1. The current in P is I and the current in Q is 2I. [Figure 8.1]

1. (a)(i)On Fig. 8.1, draw an arrow to show the direction of the magnetic field at wire Q due to the current in wire P. Label this arrow B.[1]
2. (a)(ii)On Fig. 8.1, draw another arrow to show the direction of the force acting on wire Q due to the current in wire P. Label this arrow F.[1]
3. (b)(i)State, with a reason, how the magnitude of the force acting on wire P compares with the magnitude of the force acting on wire Q.[2]
4. (b)(ii)State how the direction of the force on wire P compares with the direction of the force on wire Q.[1]

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