CAPE Physics Unit 2 · 2014 · Paper 1 · Question Q22
The potential divider in the figure above is formed from a light dependent resistor (LDR) and a resistor (R).
The LDR has a resistance of 5\ 000\ \Omega in the dark and 50\ \Omega in bright light.
The potential at A changes from near zero in the dark to 8\text{ V} in bright light.
The value of the resistor R is
- (A)
12.5\ \Omega - (B)
150\ \Omega - (C)
200\ \Omega - (D)
20\ 000\ \Omega
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