Answer:
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
Electromagnets
When an electric current flows in a wire, it creates a magnetic field around the wire. This effect can be used to make an electromagnet. A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply.
Answer:
If the mass of a car is 1200 kg, and the mass of the driver is 65 kg, the total combined mass of the car and driver expressed with the correct number of significant figures is 1265 kg.
<span>The fluid in a graduated cylinder should be read at the BOTTOM of the meniscus.</span>
Some substances look alike and the density can help you determine which is which. It also helps to tell which is heavier than the other.
