MCQ
When NPN transistor is used as an amplifier
- AElectrons move from base to emitter
- ✓Electrons move from emitter to base
- CElectrons moves from base to emitter
- DHoles moves from base to emitter
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Reason : Air bubble in water shines due to refraction of light.

[Take $\left.\varepsilon_{0}=8.85 \times 10^{-12} \,{F} / {m}\right]$
