The direction of the current in the wire is into the plane of the paper.
Draw at least three field lines to indicate the magnetic field pattern around this wire.
[2]
The magnet is placed on the digital balance. The current-carrying wire is horizontal and at right angles to the magnetic field between the poles of the magnet. The wire is fixed.
The following results are collected.
• length of the wire in the uniform field of the magnet = 6.0 ± 0.2 cm
• balance reading with no current in wire = 80.0 g
• balance reading with current in wire = 82.2 g
• current in wire = 5.0 ± 0.1 A
Calculate the magnetic flux density B, including the absolute uncertainty.
Ignore the absolute uncertainty in the balance readings.
Write your value for B to 2 significant figures and the absolute uncertainty to 1 significant figure.
B = ................................... ± ............... T [4]
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