Energy Stored in Inductor PYQs: JEE Mains Physics

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1. 1. In the given circuit below inductance values of \(L_1\), \(L_2\) and \(L_3\) are same. The magnetic energy stored in the entire circuit is \((U_t)\) and that stored in the \(L_2\) inductor is \((U_l)\). \(U_t / U_l\) is __________.
   (Ignore the mutual inductance if any)
   2026 Medium
2. 2. A solenoid having area \(A\) and length ' \(l\) ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is : 2025 Easy
3. 3. A coil has an inductance of \(2 H\) and resistance of \(4\,\Omega\). A \(10\,V\) is applied across the coil. The energy stored in the magnetic field after the current has built up to its equilibrium value will be \(..........\times 10^{-2} J\) 2023 Medium
4. 4. A coil of inductance \(2\, H\) having negligible resistance is connected to a source of supply whose voltage is given by \(V=3 t\) volt. (where \(t\) is in second). If the voltage is applied when \(t =0,\) then the energy stored in the coil after \(4\, s\) is ............ \(J\). 2021 Hard
5. 5. An inductor coil stores \(64\, {J}\) of magnetic field energy and dissipates energy at the rate of \(640\, {W}\) when a current of \(8\, {A}\) is passed through it. If this coil is joined across an ideal battery, find the time constant of the circuit in seconds 2021 Hard
6. 6. The self produced \(emf\) of a coil is \(25\,volts\). When the current in it is changed at uniform rate from \(10\,A\) to \(25\, A\) in \(1\,s\), the change in the energy of the inductance is......\(J\) 2019 Hard
7. 7. An ideal capacitor of capacitance \(0.2\, μF\) is charged to a potential difference of \(10\,V\). The charging battery is then disconnected. The capacitor is then connected to an ideal inductor of self inductance \(0.5\,mH\). The current at a time when the potential difference across the capacitor is \(5\,V\), is.....\(A\) 2018 Hard

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