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# One part of a device is connected with the negative terminal of a battery and another part is connected with the positive terminal of a battery. If their ends now altered, current does not flow in circuit, then device will be

$\begin{array}{1 1} (1)\;\text{P-N Junction} \\ (2)\; \text{Transistor} \\ (3)\; \text{Zender diode} \\ (4)\; \text{Triode} \end{array}$