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NEET
Exam
NEET
Subject
Physics
Chapter
Electromagnetic Induction

NEET · Physics · Electromagnetic Induction

Match List-I with List-II regarding the equivalent induced emf...

Match List-I with List-II regarding the equivalent induced emf across different configurations of identical ideal inductors (each of inductance LL) when a total time-varying current I(t)I(t) enters the combination. Neglect mutual inductance.

List-I (Configuration)List-II (Induced emf)
(A) Two inductors in series(I) 12LdIdt\dfrac{1}{2} L \dfrac{dI}{dt}
(B) Two inductors in parallel(II) 2LdIdt2 L \dfrac{dI}{dt}
(C) Three inductors in parallel(III) 32LdIdt\dfrac{3}{2} L \dfrac{dI}{dt}
(D) Two inductors in parallel, connected in series with a third(IV) 13LdIdt\dfrac{1}{3} L \dfrac{dI}{dt}

Choose the correct answer from the options given below:

Options

  1. A(A)-(I), (B)-(II), (C)-(IV), (D)-(III)
  2. B(A)-(II), (B)-(I), (C)-(III), (D)-(IV)
  3. C(A)-(II), (B)-(I), (C)-(IV), (D)-(III)
  4. D(A)-(II), (B)-(IV), (C)-(I), (D)-(III)

Correct answer

C. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

Step-by-step solution

The induced emf across an equivalent inductance LeqL_{eq} is given by E=LeqdIdtE = L_{eq} \dfrac{dI}{dt}.

(A) For two inductors in series, Leq=L+L=2LL_{eq} = L + L = 2L.
Induced emf = 2LdIdt2L \dfrac{dI}{dt}. (Matches with II)

(B) For two inductors in parallel, Leq=L×LL+L=L2L_{eq} = \dfrac{L \times L}{L + L} = \dfrac{L}{2}.
Induced emf = 12LdIdt\dfrac{1}{2}L \dfrac{dI}{dt}. (Matches with I)

(C) For three inductors in parallel, 1Leq=1L+1L+1L=3L⇒Leq=L3\dfrac{1}{L_{eq}} = \dfrac{1}{L} + \dfrac{1}{L} + \dfrac{1}{L} = \dfrac{3}{L} \Rightarrow L_{eq} = \dfrac{L}{3}.
Induced emf = 13LdIdt\dfrac{1}{3}L \dfrac{dI}{dt}. (Matches with IV)

(D) For two inductors in parallel connected in series with a third, Leq=L2+L=3L2L_{eq} = \dfrac{L}{2} + L = \dfrac{3L}{2}.
Induced emf = 32LdIdt\dfrac{3}{2}L \dfrac{dI}{dt}. (Matches with III)

Therefore, the correct matching is (A)-(II), (B)-(I), (C)-(IV), (D)-(III).

Answer: (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
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