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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is
  • a)
    0.29 mA
  • b)
    0.35 mA
  • c)
    0.39 mA
  • d)
    0.43 mA
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The current gain for a transistor working as common-base amplifier is ...
Solution:

Given, current gain (α) = 0.96

Emitter current (IE) = 7.2 mA

We know that the current gain for a common-base amplifier is given by the formula:

α = IC/IE

where IC is the collector current and IE is the emitter current.

Since we are given α and IE, we can find the collector current as:

IC = α × IE

IC = 0.96 × 7.2 mA

IC = 6.912 mA

We also know that the base current (IB) is related to the collector current and emitter current as:

IC = IB + IE

Therefore, the base current can be found as:

IB = IC - IE

IB = 6.912 mA - 7.2 mA

IB = -0.288 mA

Since the base current cannot be negative, we take the absolute value:

IB = 0.288 mA

Therefore, the base current is 0.29 mA (approximately).

Hence, the correct answer is option A.

Summary:

- Given: α = 0.96, IE = 7.2 mA
- We can find IC as IC = α × IE = 0.96 × 7.2 mA = 6.912 mA
- We can find IB as IB = IC - IE = 6.912 mA - 7.2 mA = -0.288 mA (absolute value is 0.288 mA)
- Therefore, the base current is approximately 0.29 mA.
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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current isa) 0.29 mA b) 0.35 mA c) 0.39 mA d) 0.43 mA Correct answer is option 'A'. Can you explain this answer?
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The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current isa) 0.29 mA b) 0.35 mA c) 0.39 mA d) 0.43 mA Correct answer is option 'A'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current isa) 0.29 mA b) 0.35 mA c) 0.39 mA d) 0.43 mA Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current isa) 0.29 mA b) 0.35 mA c) 0.39 mA d) 0.43 mA Correct answer is option 'A'. Can you explain this answer?.
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