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Explain Constant current system
Constant current system: - In this process, the charging current is kept constant by varying the supply voltage to overcome the enhanced back emf of cells. If a charging booster is used, the current supplied by it can be kept back constant by adjusting its excitation. If charged on d.c. supply, the current is controlled by differ the rheostat connected in the circuit. The value of charging current should be so chosen that there would be no excessive gassing during last stages of charging and, also, the cell temperature does not exceed 450C. This method takes a comparatively longer time
Constant current system
explain the maxima and minima in fraunhoffer difraction
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Anode rays were discovered by: (1)Goldstein (b)J. Stoney (3)Rutherford (4)J.J. Thomson Ans: (1)Goldstein
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.Define like and unlike parallel forces
The forced harmonic oscillations have same displacement amplitude at frequencies ω 1 = 400 Hz and ω 2 = 800 Hz. Evaluate the resonance frequency at which the displacement is maxi
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