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Transcript
```Mark schemes
1
2
3
4
5
6
7
A
[1]
B
[1]
B
[1]
B
[1]
A
[1]
A
[1]
(a)
(i)
interaction between current and B-field gives force on wire (1)
equal and opposite force on magnet (down) (1)
(ii)
force on wire must be up (1)
â´ current right to left (1)
by left hand rule (1)
(iii)
(force = BIl = mg = change in mass Ã 9.8)
B Ã 5.0 Ã 0.060 = 1.54 Ã 10â3 Ã 9.8 (1)
B = 0.050 T [50.3 mT] (1)
(max 6)
Page 23 of 34
```
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