Derive an expression for lifting power of a magnet
Consider two poles arranged directly opposite each other as shown in Fig. 29. Let each have an area A square meters and F Newtons be the force of alteration between them. Let one pole be moved by an incremental distance \(\delta x\) against the force Fj then the work done is obviously F\(\delta x\) Juoules.
The volume of the magnetic field between the poles is increased by A\(\delta x\)m3
Fig.29
Hence the energy stored increased by
Energy density of the magnetic field \(\times\)A\(\delta x\) Joules
Or \(F\delta x=\frac{1}{2}\left(\frac{B^2A}{\mu_0\mu}\delta x\right)Joules\)
Energy is stored in the air gap.
Hence \(\mu=1\)
\(F=\frac{B^2A}{{2\mu}_0}\)
Draw a mathematical expression for RMS value of a sinusoidal voltage \(v=V_{m}\sin{{\omega t}}\).
For the circuit shown bellow, determine the current i1,i2,i3 using nodal analysis
Why Schottky diodes are suitable for microwave region?
Derive the expression for overall noise figure of a cascaded system.
Explain the tunneling action in a tunnel diode.
Write short notes on
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Fig.22(a)