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Electromagnetic Induction — Physics STD 12 Science — Question

Gujarat 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): Tile coil in the resistance boxes are made by doubling the wire.
Reason (R): Thick wire is required in resistance box.
✓

Answer

  1. A is true but R is false.

Explanation: 

The coil in the resistance boxes are made from double wire. Due to this current in two wires flows in opposite directions i.e., magnetic flux linked with the each coil cancel each other. Thus, no e.m.f. is induced in the resistance.

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