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PhysicsEMI/ACSeries AC CircuitsMedium2 minPYQ_2021

PhysicsMediumsingle choice

The time taken for the magnetic energy to reach $25 %$ of its maximum value, when a solenoid of resistance $R$ , inductance $L$ is connected to a battery, is :

Options:

Answer:

Solution:

Magnetic energy $= \frac{1}{2} L i^{2} = 25 %$

$M E \Rightarrow 25 % \Rightarrow i = \frac{i_{0}}{2}$

$i = i_{0} (1 - R^{- R t / L})$ for charging

$t = \frac{L}{R} l n 2$

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

⏱ 2mℹ️ Source: PYQ_2021

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