Physics for IGCSE & O level - Magnets And Currents (Section 11 - No. 47)
How does the Earth’s magnetic field affect a compass?
It causes the compass needle to point North.
It causes the compass needle to point South.
It has no effect on the compass.
It causes the compass to work erratically.
คำอธิบาย
The earth's field causes the compass to point north.