ElectroMagnetic InductionHard
Question
A coil has an inductance of 0.7 henry and is joined in series with a resistance of 220Ω. When the alternating emf of 220 V at 50 Hz is applied to it then the phase through which current lags behind the applied emf and the watt less component of maximum current in the circuit will be respectively : -
Options
A.30o , 1 A
B.45o, 0.5 A
C.60o, 1.5 A
D.None of these
= tan-1
= tan-1 (1) = 45oMore ElectroMagnetic Induction Questions
The coercivity of a bar magnet is 100A/m. It is to be demagnetised by placing it inside a solenoid of length 100 cm and ...The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of t...Number of turns in primary coil of a transformer is 240. When input voltage is 20 volt, then output voltage is 2.5 volt....A small piece of metal wire is dragged across the gap between the pole pieces of a magnet in 0.4 sec. If magnetic flux b...Rate of increment of energy in an inductor with time in series LR circuit getting charge with battery of e.m.f. E is bes...