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Download Electrical principles - second edition (1958) by H Cotton PDF

By H Cotton

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8 Initial Velocity making an angle 8. e (v Sin 8) .. v=v Sin 8 f= mv 2 f=R 2 Be v Sin8 = m v Sin 2 R e mvSin e Be= - - R R = m v Sin 8 / B e If the initial velocity v is due to potential V, ~ v = Velocity, v = V--;;;--m- Electronic Devices and Circuits 18 R~ : . ) IfP is the pitch of the helix, p = v Cos e. T The distance covered along the B direction in one revolution is called the pitch of the helix. T= 21tR vSin e R= m v Sin e eB 21tm T=eB P= ~2e Vo 21tm - - = - - . 2 x 10-6 v va· C os e B Therefore, the motion is helix because of v Cos e electron moves in that direction in a straight line, and because ofv Sin e, it will describe a circle.

19). I = length of deflecting Plates s = Spacing between Deflecting Plates D = Distance between screen and Centre of Deflecting Plates Then, 12 x mv 2 = e x V v= Where ~2~d Vd e m voltage of fixed anode in volts charge of an electron in coulomb = mass of an electron in kgs. 19 Electrostatic deflection sensitivity. As the beam passes through the field of the deflection plates, the electrons are attracted Vd xe towards the positive plate by a force equal to - s Vd xe F=exE=-s The force produces an acceleration of 'a' m/sec 2 and is equal to force divided by mass me of an electron.

F= W2 - WI J h C f= A C = Velocity of Light = 3 x 10 10 cm / sec. 626 x 10-34 J - sec. f= Frequency of Radiation A = Wavelength of emitted radiation W I and W 2 are the energy levels in Joules. 6 x 10-19 Joules I C A. 626 x 10-34 Electronic Devices and Circuits 46 EI and E2 are energy levels in eY. 5 = 10-8 cm = 10- 10 m, and E2 and EI in eV. PHOTON NATURE OF LIGHT An electron can be in the excited state for a small period of 10-7 to 10- 10 sec. Afterwards it returns back to the original state.

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