Acircular loop of wire lies in the plane of the paper. an increasing magnetic field points out of the paper. what is the direction of the induced current in the loop?

Clock-wise current is induced.

Explanation:

According to Lenz law, there arises an induced EMF in such a way that the magnetic field produced by it opposes the external magnetic field. And there arises an induced current due to this induced emf. Its direction is such that it opposes the change in magnetic flux produced.

Here, in the loop, the magnetic field is out of plane and is increasing, so the current should be induced in such a way that the magnetic field produced must be nullifying the prior one and which should be into the plane of paper.

∴ Using the thumb rule, the direction of current should be in clockwise direcrton.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.