Question:

The effective resistance across the points A and I is

Updated On: Mar 4, 2024
  • $2 \Omega$
  • $1 \Omega$
  • $0.5 \Omega$
  • $5 \Omega$
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The Correct Option is B

Solution and Explanation

The given circuit reduces to equivalent resistance of 4 $\Omega$ each connected in parallel, hence
$40\,mm \frac{1}{R} = \frac{1}{4} + \frac{1}{4} + \frac{1}{4} + \frac{1}{4}$
$\Rightarrow \, 30\,mm \frac{1}{R} = \frac{4}{4}$
$\Rightarrow 30\,mm R = 1 \Omega$
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Concepts Used:

Electromagnetic Induction

Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-

  1. When we place the conductor in a changing magnetic field.
  2. When the conductor constantly moves in a stationary field.

Formula:

The electromagnetic induction is mathematically represented as:-

e=N × d∅.dt

Where

  • e = induced voltage
  • N = number of turns in the coil
  • Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
  • t = time

Applications of Electromagnetic Induction

  1. Electromagnetic induction in AC generator
  2. Electrical Transformers
  3. Magnetic Flow Meter