QJEEM21Phc739: JEE Main 2021 Physics - Class 12 JEEM21Phc739 Solution: The circuit shown in the figure consists of a charged capacitor …

Question

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The circuit shown in the figure consists of a charged capacitor of capacity 3

\mu

F and a charge of

\mu

C. At time t = 0, when the key is closed, the value of current flowing through the 5 M

\Omega

resistor is 'x'

\mu

-A. The value of 'x to the nearest integer is ___________.

JEE Main 2021 (Online) 18th March Morning Shift Physics - Capacitor Question 83 English

Accepted Answer

At time t

q = Q{e^{ - t/RC}}

I =

{{dq} \over {dt}}

=

{Q \over {RC}}{e^{ - t/RC}}

at

t = 0,I = {Q \over {RC}}{e^{ - 0/RC}}

I = {Q \over {RC}} = {{30} \over {5 \times {{10}^6} \times 3}} = 2 \times {10^{ - 6}}

A

\Rightarrow

I = 2

\mu

A

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