The figures below show two different situations where a current may be induced i
ID: 1448697 • Letter: T
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 is shown by the x's in Fig. 2 (Note that the B-field is not uniform in Fig. 2). (The compass directions are defined in the usual way. North is up, East is to the right etc.) Decide which statements correctly describe the induced current in one of the loops. If the first is T and the rest F, enter TFFFFF.
A) fig2: Loop moving South, no induced current.
B) fig1: Loop moving West, induced current `a'.
C) fig2: Loop moving North, induced current `b'.
D) fig2: Loop moving East, induced current `b'.
E) fig1: Magnet moving West, induced current `b'.
F) fig1: Magnet moving East, induced current `a'.
Explanation / Answer
A) T
Loop moving south, No change in flux so no induced current
B) T
loop moving west, decrease in inward flux so current is along direction a
C) F
loop moving North, no chage in flux so no induced current.
D) T
loop moving east decrease in inward flux current direction along b
E) T
Magnet moving west increase in inward flux current direction along b
F) T
magnet moving east,decrease in inward flux current direction along a
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