Directions: Write true if the statement is correct and false if the statement is wrong. 31. An electromagnet maybe produced by making electricity through a coil of wire wound around an iron nail. 32. When electricity stops flowing through a coil of wire, the nail continues attracting any metal or magnetic material. 33. An electromagnet can be made stronger by using less coils of wire. 34. The number of dry cells used affects the magnetism of an electromagnet. More dry cells mean less magnetism. 35. Electromagnet is a permanent magnet that can attract any metal or magnetic material. 36. Magnets are usually made of iron. 37. Materials that allow electricity and heat to flow freely through them are called conductors. 38. When an electromagnet is disconnected from a battery, it will continue attracting non-metals. 39. Rubber attracts electromagnet. 40. Electromagnets are used in transmitting signals through telephones, radio and television. ​