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```14
A wire lies perpendicularly across a horizontal uniform magnetic field of flux density 20 Ã 10â3 T
so that 0.30 m of the wire is effectively subjected to the field. If the force exerted on this length of
wire due to a current in it is 30 Ã 10â3 N downward, what is the current in the wire?
A
0.45 A from P to Q
B
0.45 A from Q to P
C
5.0 A from P to Q
D
5.0 A from Q to P
(Total 1 mark)
15
(a)
The equation F = BIl, where the symbols have their usual meanings, gives the magnetic
force that acts on a conductor in a magnetic field.
Given the unit of each of the quantities in the equation.
F ..............................
B ..............................
I ..............................
l ...............................
State the condition under which the equation applies.
......................................................................................................................
......................................................................................................................
(2)
Page 11 of 34
```
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