Physics for IGCSE & O level - Magnets And Currents (Section 10 - No. 25)
What is the effect of placing a piece of iron inside a coil of wire carrying a current?
The strength of the magnetic field decreases.
The direction of the magnetic field reverses.
The strength of the magnetic field increases.
The magnetic field is unaffected.
คำอธิบาย
The magnetic field will increase