Complete the sentence - AQA - GCSE Physics - Question 4 - 2023 - Paper 2

The diagram that shows the north pole pointing towards the south pole with arrows indicating the direction of the magnetic field is the correct one (the second diagram).

An induced magnet is a material that becomes a magnet when it is placed in a magnetic field. It loses most or all of its magnetism quickly when removed from the magnetic field.

The effect that causes the coil to move is called the motor effect.

To find the magnetic flux density, we can use the formula:

$B = \frac{F}{I \cdot L}$

where:

• $F = 0.013 \text{ N}$ (force)
• $I = 16 \text{ mA} = 0.016 \text{ A}$
• $L = 6.5 \text{ m}$

Substituting the values gives us:

$B = \frac{0.013}{0.016 \times 6.5} = 0.125 \text{ T}$

Thus, the magnetic flux density around the coil is 0.125 T.

From Figure 13, it can be observed that as frequency increases, the minimum sound level that can be heard also tends to increase for all three individuals. Individual A, who has always worked in a loud environment, can hear at lower sound levels compared to individual C, who has worked in a quiet environment. Moreover, individual B, who has also worked in a quiet environment but is older, displays characteristics similar to individual C, indicating age also influences hearing ability. This suggests that frequency sensitivity is not only dependent on age but also on the acoustic environments in which individuals have spent their time.