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If the cathode of an SCR (Silicon-Controlled Rectifier) is made positive with respect to the anode and no gate current is applied, the SCR remains in the off state, and it does not conduct. The SCR, a type of thyristor, requires the anode to be positive relative to the cathode to start conducting (forward-biased condition). Additionally, for it to switch from the off state to the on state (conducting), a gate current must be applied. Without gate current, even with the correct anode-cathode biasing, the SCR will not turn on. Therefore, in the scenario described, the SCR will not conduct current.
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Explanation: The device is in the reverse blocking state (3rd quadrant) & only the middle junction is forward biased whereas other two are reversed biased.