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Electromagnetic Induction — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Induction1 Mark
Question
Two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b ), (c) and (d) as given below.
  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and Rare true but R is NOT the correct explanation of A.
  3. A is true but R is false.
  4. A is false and R is also false.
Assertion (A): The resistance of a coil for direct current is 5 ohms. An alternating current is sent through it. The resistance will remain same.
Reason (R): The resistance of a coil does not depend upon nature of current.
✓

Answer

  1. A is false and R is also false.
Explanation: 
Both assertion and reason are false.
When an alternating current is sent through the coil then effective resistance of the coil will be $\sqrt{\text{R}^2+(\omega\text{L})^2}$ while it was only R for direct current i.e., effective resistance of coil will increases for A.C.

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