Faraday\'s law states that induced emf is directly proportionalto the time rate

Question

Faraday's law states that induced emf is directly proportionalto the time rate of change of magnetic flux. Mathematically, it canbe written as

To find the direction of the induced emf, onecan use Lenz's law:

The induced current's magnetic field opposes the change inthe magnetic flux that induced the current.

For example, if the magnetic flux through aloopincreases, the induced magnetic field isdirectedopposite to the "parent" magnetic field, thuscountering the increase in flux. If theflux decreases, the induced current's magnetic fieldhas the same direction as the parent magnetic field, thuscountering the decrease in flux.

Recall that to relate the direction of the electric current andits magnetic field, you can use the right-hand rule:When the fingers on your right hand are curled in the direction ofthe current in a loop, your thumb gives the direction of themagnetic field generated by this current.

The magnitudeof increases. The magnitudeof decreases. The loop rotatesabout the vertical axis (vertical dotted line) shown in thediagram. The loop rotatesabout the horizontal axis (horizontal dotted line) shown in thediagram. The loop moves tothe right while remaining in the plane of the page. The loop movestoward you, out of the page, while remaining parallel toitself. Try Again; 4 attempts remaining

Explanation / Answer

It is very difficult to read what is printed within thatgrid. I think there is an induced emf in all the first 4 cases; notin the last two. There is a change in agnetic flux linking the coil in thefirst 4 cases; but so in the alst 2 cases.

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