Two long, parallel straight wires, P\text{P}P and Q\text{Q}Q, carry electrical currents perpendicular to the plane of the page, as shown in the diagram.
Wire P\text{P}P carries a current I I\,I out of the page, and wire Q\text{Q}Q carries a current 3I 3I\,3I into the page. The distance between the wires is ddd.
At which position along the horizontal dashed line passing through both wires is the net magnetic flux density equal to zero?
At a distance 0.5d0.5d0.5d to the left of P\text{P}P.
At a distance 0.5d0.5d0.5d to the right of P\text{P}P.
At a distance 0.33d0.33d0.33d to the left of P\text{P}P.
At a distance 1.5d1.5d1.5d to the right of Q\text{Q}Q.
Magnets and magnetic fields Questions
Practise Edexcel GCSE Physics Magnets and magnetic fields with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Physics (1PH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.