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```(b)
(i)
(vertically) downwards on diagram â
reference to Flemingâs LH rule or equivalent statement â
Mark sequentially.
1st point: allow âinto the pageâ.
2
(ii)
number of free electrons in wire = A Ã l Ã number density
= 5.1 Ã 10â6 Ã 95 Ã 10â3 Ã 8.4 Ã 1028 = 4.1 (4.07) Ã 1022 â
Provided it is shown correctly to at least 2SF, final answer alone is
sufficient for the mark. (Otherwise working is mandatory).
1
â = 0.16 (0.159) (T) â
(iii)
â = 0.16 (0.158) (T) â ]
[or
In 2nd method allow ECF from wrong number value in (ii).
2
[10]
21
22
23
B
[1]
A
[1]
(a)
(i)
60 (degrees)
1
(ii)
angle required is 150Â°
which is 5
2
(b)
(i)
(magnitude of the induced) emf
Accept âinduced voltageâ or ârate of
change of flux linkageâ, but not
âvoltageâ alone.
1
Page 28 of 34
```
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