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Magnetic Fields - Structured Questions Q3. The diagram shows two magnets, supported on a yoke, placed on an electronic balance.
The magnets produce a uniform horizontal magnetic field in the region between them. A copper wire DE is connected in the circuit shown above, and is clamped horizontally at right angles to the magnetic field. Below is a diagram that shows a simplified plan view of the copper wire and magnets:
When the apparatus is assembled with the switch open, the reading on the electronic balance is set to 0.000 g. This reading changes to a positive value when the switch is closed. (a) Tick in the box to indicate which of the following correctly describes the direction of the force acting on the wire DE due to the magnetic field when the switch is closed.
[1 mark] (b) Label the poles of the magnets by putting N or S on each of the two dashed lines in the plan view diagram above. [1 mark] (c) Define the tesla. [1 mark] (d) The magnets are 5.00 cm long. When the current in the wire is 3.43 A the reading on the electronic balance is 0.620 g. Assume the field is uniform and is zero beyond the length of the magnets. Calculate the magnetic flux density between the magnets. [3 marks] (Total 6 marks)
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