The diagram shows a circuit with a light-dependent resistor (LDR). The ammeter reads zero current. What is the resistance of the LDR?
A.
\(6.0 \mathrm{k} \Omega\)
B.
\(18 \mathrm{k} \Omega\)
C.
\(26 \mathrm{k} \Omega\)
D.
\(30 \mathrm{k} \Omega\)
Exam No：9702_w24_qp_11 Year：2024 Question No：32
Answer:
B
Knowledge points:
9.1.1 understand that electric current is a flow of charge carriers
9.1.2 understand that the charge on charge carriers is quantised
9.1.3 define the coulomb
9.1.4 recall and use Q = It
9.1.5 derive and use, for a current-carrying conductor, the expression I = Anvq, where n is the number density of charge carriers
Solution:
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