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In the circuits (a) and (b) switches S1 and S2 are closed at t=0 and are kept closed for a long time. The variation of currents in the two circuits for t\geq 0 are roughly shown by (figures are schematic and not drawn to scale) :

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)


Answers (1)


Self Inductance -

An emf is induced in the coil or the circuit which oppose the change that causes it. Which is also known back  emf.

- wherein



In a)

q = q_{o} . (1 - e ^{-\frac{t}{RC}})

I = I_{o} . e ^{-\frac{t}{RC}} -------- 1

I_{o} = \frac{E}{R}

In b)

I = I_{o} . (1 - e ^{- \frac{tR}{L}}) -------- 2


Option 1)

This option is correct.

Option 2)

This option is incorrect.

Option 3)

This option is incorrect.

Option 4)

This option is incorrect.

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