   Chapter 20.3, Problem 20.5QQ

Chapter
Section
Textbook Problem

You intend to move a rectangular loop of wire into a region of uniform magnetic field at a given speed so as to induce an emf in the loop. The plane of the loop must remain perpendicular to the magnetic field lines. In which orientation should you hold the loop while you move it into the region with the magnetic field to generate the largest emf? (a) with the long dimension of the loop parallel to the velocity vector (b) with the short dimension of the loop parallel to the velocity vector (c) either way because the emf is the same regardless of orientation

To determine
The orientation to generate the largest emf.

Explanation

The emf generated is given by,

ΔV=Blv

• B is the magnetic field.
• l is the length of the loop.
• v is the velocity.

Conclusion:

The emf generated is proportional to the length of the loop. Hence, when the longer side of the loop is perpendicular to the velocity, the emf generated is large

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