A potential difference of 5000 volt is applied between two parallel plates 5cm a part a small oil drop having a charge of 9.6 ×10^-19 C falls between the plates. Find (a) electric field intensity between the plates and (b) the force on the oil drop

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An alternating voltage source is connected in series with a resistance R and an inductance L. If the potential drop across the resistance is 200 V and across the inductance is 150 V, then the applied voltage is:

In an a. c. circuit the instantaneous current and e.m.f. are represented as: I = I0 sin(ωt – π/6) and E = E0 sin(ωt + π /3) respectively. The voltage leads the current by

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