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For a transistor, in a common emitter arrangement, the alternating current gain $b$ is given by

• ✓
  $\beta=\left(\frac{\Delta I }{\Delta I _{ B }}\right)_{ vc }$
• B
   $\beta=$ $\left(\frac{\Delta I _{ E }}{\Delta I _{ C }}\right)_{ v c }$
• C
   $\beta=\left(\frac{\Delta I _{ c }}{\Delta I _{ E }}\right)_{ v c }$
• D
   $\beta=\left(\frac{\Delta II _{ E }}{\Delta IC _{ C }}\right)_{ v c }$