ElectroMagnetic InductionHard
Question
A closed circuit consists of a resistor R, inductor of inductance L and a source of emf E are connected in series. If the inductance of the coil is abruptly decreased to L/4 (by removing its magnetic core), the new current immediately after this moment is : (before decreasing the inductance the circuit is in steady state)
Options
A.zero
B.E/R
C.
D.
Solution
Flux through a closed circuit containing an inductor does not change instantaneously.
∴
= 
(i) ⇒ i = 
Ans.
∴
= (i) ⇒ i = Ans. Create a free account to view solution
View Solution FreeMore ElectroMagnetic Induction Questions
A uniform magnetic field exists in region given by . A rod of length 5 m is placed along y - axis is moved along x - axi...A coil of inductance 300 mH and resistance 2Ω is connected to a source of voltage 2V. The current reaches half of i...Three capacitor of capacitance C each are connected in series as shown in the figure. Initially switch S is open. Now ca...The frequency of oscillation of current in the inductor is :...The time constant of an iductance coil is 2.0 × 10-3 s. When a 90 Ω resistance is joined in series, the time c...