Acoil lies flat on a tabletop in a region where the magnetic field vector points straight up. the magnetic field vanishes suddenly. when viewed from above, what is the sense of the induced current in this coil as the field fades?

Counterclock wise

Explanation:

As the magnetic field is decreasing in nature, according to Lenz's law, the direction of induced emf is such that it always is in the opposite direction of the cause due to which it produces. Here, the magnetic field is decreasing so the direction of induced emf is such that it always in the sense such that the magnetic field is increasing.

Thus, the direction of induced current is in counter clockwise direction.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length