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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

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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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Correct option: (4) 36 mA

Explanation:

By definition, current gain α is

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