Electronic Principles
The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

300 µA
350 µA
0.25 µA
250 µA
None of these

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Electronic Principles
Which one of the following phrasers best describes flux density?

The force that maintains lines of force
None of these
The concentration of lines of magnetic force
The rate of change of the number of lines of magnetic force
The opposition to a build-up of magnetic fields

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