Item 2 Which item is necessary to make an electromagnet?

Horseshoe magnet assessment graphic

Colored wires assessment graphic

Group of paper clips assessment graphic

Electrical switch assessment graphic

What is the subscript for oxygen in its molecular formula

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.

May someone me with these science questions