In an npn power transistor the collector current is 20mA. If 98 percent of the electrons injected into base region reach collector then the base current in mA is nearly ?
Here, in this problem is it okay to take \$\beta=I_c/I_b=98/2=49\$ ?
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Sign up to join this communityIn an npn power transistor the collector current is 20mA. If 98 percent of the electrons injected into base region reach collector then the base current in mA is nearly ?
Here, in this problem is it okay to take \$\beta=I_c/I_b=98/2=49\$ ?
It sounds like they mean 98% of the emitter current, not the base current. That means you're given \$\alpha = 0.98\$. You can use that to calculate \$\beta\$ and find the base current.
You don't need to know \$\beta\$ to answer the question. Just Kirchoff's Current Law.