Alternating CurrentHard
Question
Two different coils have self-inductance L1 = 8 mH and L2 = 2 mH. The current in one coil is increased at a comsatnt rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the power given to the two coils is the same. At that that time, the current, the induced voltage and the energy stored in the first coil are i1, V1 and W1 respectively. Corresponding values for the second coil at the same instant are i2, V2 and W2 respectively. Then
Options
A.
B.
C.
D.
Solution
From Faraday′s law, the induced voltage
V ∝ L, if rate of charnge of current is constant
∴
or 
Power given to the coils is same i.e.,
v1i1 = V2i2 or
Energy stored W =
Li2
∴
or 
V ∝ L, if rate of charnge of current is constant
∴
or Power given to the coils is same i.e.,
v1i1 = V2i2 or
Energy stored W =
Li2∴
or Create a free account to view solution
View Solution FreeMore Alternating Current Questions
A resistor R, an inductor L and a capacitor C are connected in series to an oscillator of frequency υ. If the reso...With increase in frequency of an AC supply, the capacitive reactance :...An A.C. circuit containing only capacitance, the current :...An alternating potential V = V0 sin ωt is applied across a circuit. As a result the current I = I0 sin flows in it....The value of current at half power points is :...