An inductor of inductance 2.00 H is joined in series with a resistor of resistance 200 Ω and a battery of emf 2.00 V. At t = 10 ms, find the rate (in mW) at which energy is being stored in magnetic field. (Given e−1 = 0.37)
Physics · Electromagnetic Induction
JEE Advanced

Question

An inductor of inductance 2.00 H is joined in series with a resistor of resistance 200 Ω and a battery of emf 2.00 V. At t = 10 ms, find the rate (in mW) at which energy is being stored in magnetic field. (Given e−1 = 0.37)

Physics · Electromagnetic Induction

G1 Physics · Accepted Answer

Use εₗ=−L(dI/dt), U=½LI², and for mutual induction ε₂=−M(dI₁/dt). Applying the stated geometry/circuit condition gives 4.6.