Answer:
Induced emf, 
Explanation:
The varying magnetic field with time t is given by according to equation as :

Where
are constant
Let
is the emf induced in the loop as a function of time. We know that the rate of change of magnetic flux is equal to the induced emf as:





So, the induced emf in the loop as a function of time is
. Hence, this is the required solution.
Answer:
, level is rising.
Explanation:
Since liquid water is a incompresible fluid, density can be eliminated of the equation of Mass Conservation, which is simplified as follows:


By replacing all known variables:

The positive sign of the rate of change of the tank level indicates a rising behaviour.
Answer:
Probably competition with television news-
by 1953 television was becoming common in many houses and people could obtain news from television newscasts