The si unit of current gain is

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00:00Question says, the SI unit of current gain is A volt, B ampere, C coulomb, D no units.

00:17And current gain, beta, is the ratio of collector current and base current.

00:34So, the unit of collector current is ampere and the base current is also ampere.

00:44So, ampere will be get cancelled with ampere.

00:47So, it will be equal to 1, means there is no unit of current gain.

00:54So, the correct option will be D no unit, means current gain is unit less and dimension less,

01:09because it is the ratio between two same physical quantities.