Question

The ratio of current through the ammeter at t = 0 and t =  where t = 0 is the time of closing the switch –

• A. 5 : 2
• B. 2 : 5
• C. 1 : 1
• D. 0

Answer 1

Answer: (A)

5 : 2

Answer 2

At t = 0 capacitor acts as short circuit hence no current flows through h R₂ = 3W.

I_{t = 0} = $\frac { \mathrm { V } } { \mathrm { R } _ { 1 } } = \frac { 5 } { 2 }$

At t=  capacitor acts as open switch hence current will flow through R₂

I_{t = } = $\frac { \mathrm { V } } { \mathrm { R } _ { 1 } + \mathrm { R } _ { 2 } } = \frac { 5 } { 5 }$ = 1 A