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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACAC current and voltageMedium2 minQB

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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 $t = 0$
$i = \frac{i _{0}}{2}$ 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: QB

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