a. State Ampere's Law and use it to derive an expression for the magnetic field due to solenoid.b. In a certain circuit, the transistor has a collector current of 20 mA and a base current of 80 μA. What is the current gain of the transistor?

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a. State Ampere's Law and use it to derive an expression for the magnetic field due to solenoid.b. In a certain circuit, the transistor has a collector current of 20 mA and a base current of 80 μA. What is the current gain of the transistor?