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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Electromagnetic Induction

NTA Abhyas 2020 · Physics · Electromagnetic Induction

In the circuit shown below, i _ 1 and i _ 2 are the steady-state...

In the circuit shown below, i1{i}_{1} and i2{i}_{2} are the steady-state values of the current through L1{L}_{1} and L2{L}_{2} respectively,& then i1{i}_{1}& is

In the circuit shown below, i _ 1 and i _ 2 are the steady-state values of the current through L _ 1 and L _ 2

Options

  1. A{i}_{1 =}\dfrac{E{L}_{2}}{R\left({L}_{1} + {L}_{2}\right)}
  2. B{i}_{1 =}\dfrac{E{L}_{1}}{R\left({L}_{1} + {L}_{2}\right)}
  3. Ci1=EL2RL1L2{i}_{1 =}\dfrac{E{L}_{2}}{R\sqrt{{L}_{1}{L}_{2}}}
  4. Di1=EL1RL1L2{i}_{1 =}\dfrac{E{L}_{1}}{R\sqrt{{L}_{1}{L}_{2}}}

Correct answer

A. {i}_{1 =}\dfrac{E{L}_{2}}{R\left({L}_{1} + {L}_{2}\right)}

Step-by-step solution

Since the potential difference across the inductors is same, we get

L1di1dt=L2di2dt{L}_{1}\dfrac{d{i}_{1}}{dt} = {L}_{2}\dfrac{d{i}_{2}}{dt}

L1di1=L2di2{L}_{1}d{i}_{1} = {L}_{2}d{i}_{2}

L1∆i1=L2∆i2{L}_{1} ∆ {i}_{1} = {L}_{2} ∆ {i}_{2}

L1i1=L2i2{L}_{1}{i}_{1} = {L}_{2}{i}_{2} (Since the initial value of current through both the inductors was zero)&

i1i2=L2L1\dfrac{i1}{i2} = \dfrac{L2}{L1}

The steady current ii passing through RR is

i=ER\text{i} = \dfrac{E}{R}

i1=(L2L1+L2)i=EL2R(L1+L2){i}_{1} = \left(\dfrac{L2}{{L}_{1} + {L}_{2}}\right)i = \dfrac{E{L}_{2}}{R\left({L}_{1} + {L}_{2}\right)}

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