In only one of the circuits given below, the lamp L light. Which circuit is it ? Give reason for your answer.
Text Solution
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The lamp L light up in the circuit shown in Fig. because in this circuit, the input circuit (emitter-base circuit) is forward biased and output circuit (collector-emitter circuit) is reverse biased. The lamp L does not light up in the circuit shown in Fig. because in this case, the input circuit (emitter-base circuit) is reverse biased and output circuit (collector-emitter circuit) is forward biased.
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