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PhysicsEMI/ACAC current and voltageMedium2 minPYQ_2021

PhysicsMediumsingle choice

An $A C$ source rated $220 V, 50 Hz$ is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :

Options:

Answer:

Solution:

$i = i_{0} \cos (ω t)$
$i = i_{0}$ at $t = 0$
$i = \frac{i_{0}}{\sqrt{2}}$ at $ω t = \frac{π}{4}$
$t = \frac{π}{4 ω} = \frac{π}{4 (2 π f)} = \frac{1}{8 f}$
$t = \frac{1}{400} = 2.5 ms$

Stream:JEESubject:PhysicsTopic:EMI/ACSubtopic:AC current and voltage

⏱ 2mℹ️ Source: PYQ_2021

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