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

Figure 1. a) Magnet moving west, induced current "a". b) magnet moving east, induced current 'b". c) loop moving west, induced current "a" Figure 2. a) loop moving east, no induced current. b) loop moving north, induced current "a" c) loop moving east, induced current "a"

Explanation / Answer

figure 1:

a) Magnet moving west, induced current "a" ------ false

if the magnet is moving west, more flux will travel through the loop. Thus, the induced current will be such as to gain flux. Using the right hand rule, more flux will be in the loop if current travels in the direction indicated by ’b’

b) magnet moving east, induced current 'b' ------- true

if the magnet is moving east, less flux will travel through the loop. Thus, the induced current will be such as to gain flux. Using the right hand rule, more flux will be in the loop if current travels in the direction indicated by ’b’

c) loop moving west, induced current "a --------- true

if the loop moves west, the same principle as the magnet moving east applies

figure 2:

a) loop moving east, no induced current ------- true

since the flux is not changing through the loop, there is no induced current

b) loop moving north, induced current "a"---------- false

c) loop moving east, induced current "a" -------- True,

since the loop is moving into a region of lesser magnetic field, the induced current will be such as to oppose that change; that is, to increase the flux.Using the right hand rule, the current will flow in the direction indicated by ’a’.

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