write TRUE if the statement is correct and FALSE if it is not

1. strength of an electromagnet can be increased by adding nunber of coil wire

2. electromagnet is produced by letting electricity passed through a coil of wire wound around an iron core

3. adding more dry cells in an electromagnet will not affect the strength of its magnetism

4. the smaller the iron core in an electromagnet the stronger is magnetism

5. using three dry cells will give a stronger magnetims than just having one dry cell

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