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Electromagnetic Induction question

2019 · 11 Jan · Shift 1 · Q60
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Electromagnetic Induction question

2019 · 11 Jan · Shift 1 · Q60

JEE MainPhysicsElectromagnetic InductionMCQ+4 / −1
There are two long co-axial solenoids of same length lll. The inner and outer coils have radii r1 and r2 and number of turns per unit length n1 and n2, respectively. The ratio of mutual inductance to the self - inductance of the inner-coil is :
  1. A
    n2n1.r22r12{{{n_2}} \over {{n_1}}}.{{{r_2}^2} \over {{r_1}^2}}n1​n2​​.r1​2r2​2​
  2. B
    n2n1{{{n_2}} \over {{n_1}}}n1​n2​​
  3. C
    n1n2{{{n_1}} \over {{n_2}}}n2​n1​​
  4. D
    n2n1.r1r2{{{n_2}} \over {{n_1}}}.{{{r_1}} \over {{r_2}}}n1​n2​​.r2​r1​​
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