A student placed a magnet close to each metal sample - AQA - GCSE Physics Combined Science - Question 1 - 2020 - Paper 2

If the paper clip is removed from the magnetic field and then brought close to the south pole of the permanent magnet, the paper clip would still be attracted to the magnet. This is because the paper clip becomes an induced magnet due to the magnetic field from the permanent magnet.

The equation that links gravitational field strength, mass, and weight is given by: $W = mg$

To find the maximum force the magnet can exert, we first calculate the weight of the total number of paperclips:

Each paper clip has a mass of 1.0 g, which is equivalent to 0.001 kg. Therefore, the total mass of 20 paperclips is:

$ext{Total mass} = 20 imes 0.001 ext{ kg} = 0.02 ext{ kg}$

Using the gravitational field strength:

$ext{Weight} = 0.02 ext{ kg} imes 9.8 ext{ N/kg} = 0.196 ext{ N}$

Thus, the maximum force the magnet can exert is 0.196 N.