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  4. A small rectangular loop of wire in the plane of the paper is moved with uniform speed across a limited region of uniform magnetic field perpendicular to the plane of the paper as shown below. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/b1fed01390322a2de4a48a1b119aa57a-.jpeg /> Which graph would best represent the variation of the electric current I in the wire with time t?

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Q. A small rectangular loop of wire in the plane of the paper is moved with uniform speed across a limited region of uniform magnetic field perpendicular to the plane of the paper as shown below.
image
Which graph would best represent the variation of the electric current I in the wire with time t?

KVPYKVPY 2009Electromagnetic Induction

Solution:

As the loop is moving in the region of magnetic flux, induced emf is
$E = Blv$ (volts)
Value of emf remains same till the loop is going in or out of loop.
Direction of induced emf is (in accordance with Lenz’s law) anti-clockwise (taken positive) when loop is going in the region of field and it becomes clockwise as the loop is moving out of region of field.