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Explain Extrinsic Semiconductor.
Extrinsic Semiconductor: An intrinsic semiconductor is able to conduct some current even at room temperature but as this is not helpful for the preparations of different electronic devices. To make this conductive a small amount of impurity is added. That process is termed as doping. A semiconductor to that an impurity at controlled rate is added to make this conductive is termed as an extrinsic semiconductor. When a pentavalent impurity is added a huge of free electrons will exist and the semiconductor is termed as n-type semiconductor. When a trivalent impurity is added many of holes will exist in the semiconductor and this is termed as p-type semiconductor.
15 cells with emf for every cell are 1.5V and internal resistance 0.3Ω is linked in parallel. Calculate the value of current flow if the external resistance, 5Ω is linked to them.
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