Question

how would you position a flat loop of wire in a chainging magnetic field so that there is no emf induced in the loop​

Answer 1

Answer:

How would you position a flat loop of wire in a changing magnetic field so that there is no induced emf in the loop? Position the loop so that the field lines run perpendicular to the area vector or parallel to the surface.

Answer 2

Answer:

Place the loop so that the field lines are either parallel to the surface or perpendicular to the area vector.

Explanation:

We have a flat loop of wire and there is changing magnetic field.

So we have to place this flat loop of such that there is no induced emf in the loop.

The induced emf is given as $e=-\frac{d}{dt}(BA)$

The rate of change of flux should be zero for no induced emf.

The flux is given as, $B=BA cos(\theta)$.

For flux to be zero, $cos(\theta)$ must be zero.

$cos(\theta)=0\\\theta=90^o$

So the area vector A and the magnetic field lines B should have an $90^o$angle between them.

If they will have an $90^o$ angle between them then the flat loop of wire must be parallel to the magnetic field lines.

Therefore, the flat loop needs to be placed such that its surface is parallel to the magnetic field's direction.

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