1a3 marks
i)
Name the rule which can be used to predict the direction of the force perpendicular to a current-carrying conductor in a magnetic field.
[1]
ii)
A student places four wires of different lengths (A, B, C and D) perpendicular to different magnetic fields with different currents flowing.
Look at the table of the results.
| Wire | Magnetic fluxdensity (T) | Current (A) | Length (m) |
| A | 0.10 | 2.5 | 0.50 |
| B | 0.15 | 2.0 | 0.75 |
| C | 0.20 | 4.5 | 0.25 |
| D | 0.25 | 5.0 | 1.00 |
Use the results to show that wire D experiences the highest force.
Show your working.
[2]
1b6 marks
i)
The student decides to build a model transformer.
The transformer is a step-up transformer which doubles the input voltage.
Describe how she could build this step-up transformer in a science laboratory.
The transformer is a step-up transformer which doubles the input voltage.
Describe how she could build this step-up transformer in a science laboratory.
[4]
ii)
Suggest one risk associated with this experiment and how it can be reduced.
[2]
1c2 marks
Describe how a microphone works.
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