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Physics for IGCSE & O level - Magnets And Currents (Section 7 - No. 4)

What will happen if a piece of iron is placed inside a coil of wire carrying a current?
The strength of the magnetic field will decrease.
The strength of the magnetic field will increase.
The magnetic field will reverse direction.
The magnetic field will disappear.

توضیح

The strength will increase.

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