Question

14b. An 8.0-mH inductor and a 2.0-12 resistor are wired in series to a 20-V ideal battery. A switch in the circuit is closed at time t= 0, at which time the current is zero. Immediately after the switch is thrown the potential differences across the inductor and resistor are: A) O V, 20 V B) 20 V,0 V C) 10 V, 10 V D) 16 V, 4 V E) unknown since the rate of change of the current is not given Ans: B

Answer 1

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E-iral di Ita : iz & Cie Riting .: Vy a ir = E(-ER*12) at t=0-> V=0 Ue = - 2 d = - EL (A - RAL) at t=0 = U,=-E it means at t=0 Inductor has pot diff=20v Resistor has a = o v in option ③

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