Deduce the expression for the voltage gain, A of a amplifier.

Deduce the expression tau=PxxE

Deduce the expression for the capacity of a parallel plate condenser.

Deduce the expression for the magnetic dipole moment of a revolving electron.

Deduce the expression for the total energy of the electron in te n orbnit of a hydrogen atom in the Bohr model.

Deduce the expression for refractive index n of a prism, which is given by n= (sin[(A+D_m)//2])/(sin(A//2))

Deduce the expression of energy stored in a capacitor.

The input resistance of a silicon transistor is 100 Ω. Base current is changed by 40μA which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4K Ω. Find the voltage gain of the amplifier.