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In a transistor the current amplification ‘α’ is 0.9.

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In a transistor the current amplification ‘α’ is 0.9. The change in collector current when base current changes by 4 mA is

(1) 4 mA

(2) 12 mA

(3) 24 mA

(4) 36 mA

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(4) 36 mA

By definition, current gain α is

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