Physics · Oct / Nov 2022 · Paper 42 · Question 8
0625
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Fig. 8.1 shows an electrical circuit. V Y Fig. 8.1
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8(a)[3]
(RY) decreases
change in V consistent with stated effect on RY
change in RY / Rtotal consistent with their stated effect on RY
OR
change in proportion of the total p.d. across Y (or proportion of total p.d. across fixed resistor) consistent with their stated effect on RY
8(b)(i)[3]
(n =) 1.9 × 1019
I = Q / t
C1 (n =) 3(.0) / 1.6 × 10–19 OR (n =) Q / 1.6 × 10–19
C1
8(b)(ii)[2]
(P =) 36 W
P = IV OR (P =) IV OR 3(.0) × 12
C1
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