Q13 / 68 · NTA Abhyas (JEE Main) 2020 · Physics · Electromagnetic Induction

In the circuit shown below, i1 and i2 are the steady-state values of the current through L1 and L2 respectively, then i1 is

Figure

  • Correct answer
    A
    i1=EL2RL1+L2
  • B
    i1=EL1RL1+L2
  • C
    i1=EL2RL1L2
  • D
    i1=EL1RL1L2

Solution

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

L1di1dt=L2di2dt

L1di1=L2di2

L1∆i1=L2∆i2

L1i1=L2i2 (Since the initial value of current through both the inductors was zero) 

i1i2=L2L1

The steady current i passing through R is

i=ER

i1=L2L1+L2i=EL2RL1+L2

Hence, the correct answer is option: 'A'.

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