Magnets and Electromagnets: Grade 7 Science Quiz

A permanent magnet has a magnetic field all the time. This means it can attract certain metals like iron or steel. Examples: bar magnet and a horseshoe magnets Clitheroe, et al., 2013).

Magnetism is an invisible force that causes certain metals like iron, steel, and nickel to be attracted or repelled by magnets (Clitheroe, et al., 2013).

A horseshoe magnet is shaped like a U, which allows the north and south poles to be closer together. This makes the magnetic field stronger between the poles, which will allow it to lift much heavier metal objects (Clitheroe, et al., 2013).

Bar magnets are rectangular prism shaped magnets with a north pole at one end and a south pole at the other (Clitheroe, et al., 2013).

Here is the correct drawing, make sure you have the correct labels and drawings.

You may use this YouTube Video as a guide:

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3Dz6nR6-9wyQQ&psig=AOvVaw0_adyQHul4hJLyXxKcY5WO&ust=1763818867415000&source=images&cd=vfe&opi=89978449&ved=0CBgQjhxqFwoTCOCovbyvg5EDFQAAAAAdAAAAABAE

The magnetic field around the Earth protects us from harmful space radiation and will cause compass needles to align with the Earth’s magnetic field of the north pole (Clitheroe, et al., 2013).

A lodestone is a naturally occurring rock made of magnetite, which is a magnetic substance that can attract metal objects (Clitheroe, et al., 2013).

Magnetic materials such as iron and steel will stick to a magnet. Where non magnetic materials like sand, plastic, or wood will not. This is a way of separating mixtures of metals and non-metals when it is mixed together such as sand and iron shavings (Clitheroe, et al., 2013).