Answer you can increase the strength of an electromagnet by:   1) Increasing the current flow   2) Increasing the number of coils   3) Passing an 'iron core' throu â¦ gh the coil of the electromagnet. + 63 others found this useful. FrmtheAngel Johnson.
Crowns can be made of a variety of different materials and new materials are continually being introduced. Some of the most popular options are listed below. Porcelain bonded to precious metal: this is what most crowns are made from. A precious metal base is made and then porcelain is applied in layers over it. Porcelain: these crowns are made entirely out of porcelain and are not as strong as bonded crowns.
Metal crowns are made of gold. They generally last a long time and won t chip or break. They tend not to wear down your opposing natural teeth. However, the gold colour does not look natural, particularly on front teeth.etal crowns are made of gold. They generally last a long time and won t chip or break. They tend not to wear down your opposing natural teeth. However, the gold colour does not look natural, particularly on front teeth.