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 : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.