Question

in the given circuit initial charge on the capacitor 1.5C with polarity as shown is zero now at t=0if the key k is closed then the minimum current through the key is​

Answer 1

Answer:

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Answer 2

Answer:

Minimum current through key is 4A

Explanation:

Given,

Initial charge on capacitor(Q)=1.5C

From figure,Capacitance(C)=0.25F

To find current,we need to find potential of capacitor.It can be found by relation

$Q=CV \\ = > V = \frac{Q}{C}$

By substituting given values,we get

$V = \frac{1.5}{0.25} = 6V$

Since,potential is known current can be found by using kirchoff's law across loop which consists of capacitor

Therefore by using kirchoff law ,we get

$+ 2 + 6 - 2i = 0 = > i = 4 A$

Therefore minimum current through key is 4A

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