The figures below show two different situations where a current may be induced i

Question

The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field strength in Figure 2 is represented by the density of dots. Select true or false for the current in the loop. The cardinal directions are as defined in the compass rose.

True False  Fig 1: Loop moving West, induced current 'b'.
True False  Fig 1: Magnet moving West, induced current 'b'.
True False  Fig 2: Loop moving West, induced current 'a'.
True False  Fig 1: Magnet moving East, induced current 'a'.
True False  Fig 2: Loop moving North, no induced current.
True False  Fig 2: Loop moving North, induced current 'b'.

The figures below show two different situations where a current may be induced in a loop according to Faraday's Law, with the direction given by Lenz' Law. The magnetic field strength in Figure 2 is represented by the density of dots. Select true or false for the current in the loop. The cardinal directions are as defined in the compass rose.True False Fig 1: Loop moving West, induced current 'b'. True False Fig 1: Magnet moving West, induced current 'b'. True False Fig 2: Loop moving West, induced current 'a'. True False Fig 1: Magnet moving East, induced current 'a'. True False Fig 2: Loop moving North, no induced current. True False Fig 2: Loop moving North, induced current 'b'.

Explanation / Answer

The Faraday-lenz says that when the magnetic flux changes, the induced current must generate an opposite field that it compensates this change. So

A) False. The flux decreases and the induced current must compensate this change generating a field towards east. The induced current is a

B)True. The flux increases and the induced current is b

C) False. The flux increases to the west because the strenght of the field is higher than the east. So the current has to be opposite to this change in the flux. The induced current is b.

D)True. The same of A) because the distance between the loop and the magnet is increasing and the flux decreases

E) True. If the flux does not change, the induced current is not going to change. The density f the dots is the same as north as south.

F)False. The same than E)

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