The arm P Q of a rectangular conductor is moving from x = 0 to x = 2 b outwards and then inwards from x = 2…

The arm PQ of a rectangular conductor is moving from x=0 to x=2b outwards and then inwards from x=2b to x=0 as shown in the figure. A uniform magnetic field perpendicular to the plane is acting from x=0 to x=b. Identify the graph showing the variation of different quantities with distance:

  1. A—Flux, B—Power dissipated, C—EMF
  2. A—Power dissipated, B—Flux, C—EMF
  3. A—Flux, B—EMF, C—Power dissipated
  4. A—EMF, B—Power dissipated, C—Flux

Solution

As rod moves in field area increases upto x=b, then field is absent and again flux is generated on return journey from x=b to x=0. Thus plot A for flux.
⇒e=-dϕdt⇒ curve B for emf
⇒ Power dissipated =vi⇒ curve C for power dissipated

Asked in: JEE Main 2021 (20 Jul Shift 1)

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