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NEET
Exam
NEET
Subject
Physics
Chapter
Electromagnetic Induction

NEET · Physics · Electromagnetic Induction

Two distinct inductors store the exact same amount of magnetic...

Two distinct inductors store the exact same amount of magnetic energy. If the ratio of their inductances is 1:41:4, what is the ratio of the currents flowing through them?

Options

  1. A1:41:4
  2. B4:14:1
  3. C2:12:1
  4. D1:21:2

Correct answer

C. 2:12:1

Step-by-step solution

Let the inductances be L1andL2L_1 and L_2, and the currents be i1andi2i_1 and i_2.

The magnetic energy stored in an inductor is given by U=12Li2U = \dfrac{1}{2} L i^2.

Since the energies are equal:
U1=U2U_1 = U_2
12L1i12=12L2i22\dfrac{1}{2} L_1 i_1^2 = \dfrac{1}{2} L_2 i_2^2

Rearranging for the ratio of currents:
\left(\dfrac{i_1}{i_2}\right)^2 = \dfrac{L_2}{L_1}<br><br>Giventhat<br><br>Given thatL_1 : L_2 = 1 : 4,wehave, we have\dfrac{L_2}{L_1} = \dfrac{4}{1}.<br><br>(i1i2)2=4.<br><br>\left(\dfrac{i_1}{i_2}\right)^2 = 4
i1i2=21\dfrac{i_1}{i_2} = \dfrac{2}{1}

Therefore, the ratio of the currents is 2:12:1.

Answer: 2:12:1
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