Physics for IGCSE & O level - Magnets And Currents (Section 9 - No. 13)
What is the effect of inserting an iron core inside a coil of wire (solenoid) carrying a current?
The magnetic field strength increases.
The magnetic field strength decreases.
The direction of the magnetic field reverses.
The magnetic field disappears.
คำอธิบาย
The strength increases