Magnetic Force

If the magnet on the right is flipped so that the south pole is on the left, the magnetic force will be (I)___________. As the two magnets are moved closer together, the magnetic force between them will become (II)____________.

• (I) attractive 

• (I) repulsive

• (II) stronger

• (II) weaker

If the two magnets were cut in half along the line between the red and blue paint, which statement would describe the four bars that are produced?

• Each piece would have one magnetic pole and a nonmagnetic end.

• Each piece would have a north pole and a south pole.

• Two pieces would only have south poles and the other two pieces would only have north poles.

Which statements describe the iron-containing rock and the nails? Choose all statements that apply.

• The rock is a magnet.

• The nails are attracted to magnets.

• Most of the magnetic domains in the rock are randomly oriented.

• Most of the magnetic domains in the rock are aligned with each other.

Choose whether the actions described in the statement would increase, decrease, or not affect the magnetic force between the nails and the magnetic rock.

1. Removing half of the rock

• increase 

• decrease 

• not affect

Choose whether the actions described in the statement would increase, decrease, or not affect the magnetic force between the nails and the magnetic rock.

2. Moving the rock and nails higher

• increase

• decrease

• not affect

Choose whether the actions described in the statement would increase, decrease, or not affect the magnetic force between the nails and the magnetic rock.

3. Increasing the distance between the rock and the nails

• increase

• decrease

• not affect

Choose whether the actions described in the statement would increase, decrease, or not affect the magnetic force between the nails and the magnetic rock.

4. Replacing the rock with a similarly-sized stronger magnet

• increase

• decrease

• not affect

A magnet is passed 10 centimeters above a desk. A paper clip resting on the desk begins to move as the magnet passes over it. Based on this observation, the paper clip likely contains __________.

• plastic 

• iron 

• aluminum

When the magnet is passed 5 centimeters above the desk, the paper clip jumps upward and sticks to the magnet. This is because the magnetic force_________.

• increased

• decreased

• did not change

The element cobalt displays many similarities to the element iron and is also attracted to magnets. Based on this information, it is likely that cobalt ________ magnetic domains.

• does not form

• forms