A vertically oriented square loop of copper wire falls from rest in a region in which the field B is horizontal

Question

Question

A vertically oriented square loop of copper wire falls from rest in a region in which the field B is horizontal,

uniform, and perpendicular to the plane of the loop, into a field-free region, see (Figure 1). The side length

of the loop is s and the wire diameter is d. The resistivity of copper is pr and the density of copper is

Pm If the loop reaches its terminal speed while its upper segment is still in the magnetic-field region, find

an expression for the terminal speed.

Part A

Consider the case in which the entire loop is in the magnetic-field region. Is there an induced emf in this case?

Answer 1

Answer #1

No induced emf.

When the loop is completely inside the field, the magnetic flux is constant since the magnetic field is uniform and Area of the loop is a constant.

Flux = BA.

Now change in flux = 0. Hence no induced emf.

Answer 2

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