A coil of resistance 400Ω is placed in a magnetic field. If the magnetic flux ф (Wb) linked with the coil varies with time t (sec) as ф = 50t2 + 4. The current in the coil at t = 2 sec is

Question:

Options :

(а) 0.5 А
(b) 0.1 A
(c) 2 A
(d) 1 A

Answer :

(а) 0.5 А

Answer Steps :

Step 1:

Step 2:

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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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