Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACSeries AC CircuitsEasy2 minPYQ_2020

PhysicsEasysingle choice

An inductor coil stores $32 J$ of magnetic field energy and dissipates energy as heat at the rate of $320 W$ when a current of $4 A$ is passed through it. The time constant of the circuit when this coil is joined across an ideal battery will be

Options:

Answer:

Solution:

We know that $U = \frac{1}{2} L I^{2}$

$\Rightarrow 32 = \frac{1}{2} L {(4)}^{2}$

$\Rightarrow L = 4 H$

And power $P = I^{2} R$

$\Rightarrow 320 = {(4)}^{2} R$

$\Rightarrow R = 20 Ω$

We know that $τ = \frac{L}{R}$

$\Rightarrow τ = \frac{4}{20}$

$\Rightarrow τ = 0.2 s$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:EMI/ACSubtopic:Series AC Circuits

⏱ 2mℹ️ Source: PYQ_2020

Doubts & Discussion

Loading discussions...