1. (i) Correct
direction shown (anticlockwise) B1
(ii) Direction in which positive charges / ions
move / Direction / flow / current /
from positive to negative / Flow of (positive) charge from positive to
negative / Direction / flow opposite to electron flow B1
(iii) Q = It (Allow any subject with or without delta notation) C1
I
= 0.76/5.0 x 60 C1
current
= 2.53 ´ 10–3 (A) » 2.5 ´ 10–3 (A) A1
(0.152
/ 0.15 (A) scores 1/3)
[5]
2. (i) n = I/Aev (1)
= 0.75 / (4.0 × 10–7 × 1.6 ×
10–19 × 1.4 × 10–4)
= 8.4 × 1028 (1) 2
(ii) 1
drift velocity = 4.7 × 10–5 m s–1 (1)
2 drift velocity = 3.5 × 10–5 m s–1 (1) 2
[4]
3. (i) Thermistor B1
(ii) I1 = 51 (mA) B1
I2 = 9 (mA) B1
I3 = 29 (mA) B1
[4]
4. (e.m.f.
=) W/q / (e.m.f. =) 78/24 C1
(e.m.f. =) 3.25 »
3.3 (V) A1
[2]
5. (a) Into the page B1
(b) I=Q/t (Allow
other subject, with or without D) C1
(charge =) 7800 ´
0.23 C1
1.794 ´ 103 » 1.8 ´
103 (C) (Ignore minus sign) A1
(1.8 ´ 106 (C) scores 2/3)
(c) (number
=) 1.79 x 10^-3/e (Possible
ecf) C1
(number =) 1.12 ´
1022 » 1.1 ´ 1022 A1
[6]
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