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Q. The gain of an amplifier without feedback is 100 and the gain of an amplifier with feedback is 200. Calculate the feedback fraction.
Solution : Voltage gain after feedback,
Af = A / 1 - Aβ
200 = 100 / 1 - 100 β
2 = 1 / 1 - 100 β
2 - 200 β = 1 (that is) 200 β = 1
β = 1 /200 = 0.005
Q. An emf of 5 V is persuading when the current in the coil changes at the rate of 100 As-1. Find the coefficient of self induction. Solution: Induced emf e = - L dI/dt
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