A permanent magnet is held stationary above a horizontal loop of wire while the horizontal loop...
A permanent magnet is held stationary above a horizontal loop of wire while the horizontal loop of wire's area decreases. What is the direction of the induced current in the loop if any? The magnet's N is facing up and the S is facing down.
Homework Answers
The flux is upwards, but as the area decreases the upward flux
decrases , so the current generates more upwards flux.
So, we conclude current is in anti clockwise direction when seen
from up.
Since flux coming out is decreasing so
by lenz law
Current will be induced anti-clockwise
there will not be any current as the magnet is stationary , no
change in magnetics flux
E = - d phi / dt , here d phi = 0
according to lenz law current will flow in a direction to restrict the change in flux
so when the area is decreasing ,
flux through it is decreasing
so so current will be in clockwise direction,so that the induced field in the same direction of flux
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