A long, straight, horizontal wire carries a constant DC current I I\,I directed from South to North, as shown in the diagram below.
At point P2\text{P}_2P2, located at a distance of 8.0 cm directly below the wire, the magnetic flux density due to the current is 12 μT12\ \mu\text{T}12 μT directed West.
What is the magnetic flux density (both magnitude and direction) due to the current at point P1\text{P}_1P1, which is located at a distance of 24 cm directly above the wire?
4.0×10−6 T4.0 \times 10^{-6}\text{ T}4.0×10−6 T directed East
4.0×10−6 T4.0 \times 10^{-6}\text{ T}4.0×10−6 T directed West
3.6×10−5 T3.6 \times 10^{-5}\text{ T}3.6×10−5 T directed East
1.3×10−6 T1.3 \times 10^{-6}\text{ T}1.3×10−6 T directed West
Permanent and induced magnetism, magnetic forces and fields Questions
Practise AQA GCSE Physics Permanent and induced magnetism, magnetic forces and fields with exam-style questions for Foundation and Higher tier. 12 questions covering Poles of a magnet and Magnetic fields, matched to the AQA GCSE Physics (8463) 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.