An n-p-n transistor has three leads A, B and C. Connecting B and C by moist fingers, A to the positive lead of an ammeter, and C to the negative lead of the ammeter, one finds large deflection. Then, A, B and C refer respectively to :

Step-by-step solution

Now, according to the question, A lead of the transistor is connected to the positive lead of the ammeter and the ammeter gives a deflection. We know that in an n-p-n transistor, the emitter and the collector are negatively doped, while the base is positively doped. So, in this type of transistor the electric field is from the base to the other terminals. Thus, the lead A must be the base of the transistor. Now, the lead C is connected to the negative lead of the ammeter. Also, the leads B and C are connected by mo