Questions
Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance
detailed solution
Correct option is D
When the two coils are joined in series such that the winding of one is opposite to the other, then the emf produced in first coil is 180o out of phase of the emf produced in second coil. Thus, emf produced in first coil is negative and the emf produced in second coil is positive so, net inductance isL=L1+L2=L+L⇒L=−ϕi+ϕi=0Talk to our academic expert!
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Two different coils have self-inductance mH, . The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are and respectively. Corresponding values for the second coil at the same instant are and respectively. Then
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