As shown in the figure, 
and 
are two coaxial conducting loops separated by some distance. When the switch 
is closed, a clockwise current 
flows in 
(as seen by 
) and an induced current 
flows in 
. The switch remains closed for a long time. When 
is opened, a current 
flows in 
. Then the directions of 
and 
(as seen by 
) are
Text Solution
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When S is closed, the clockwise current 
flowing through P produces a magnetic field 
directed from 
to 
to 
. This field 
, by Lenz's law, causes an anticlockwise current 
in Q. When S is opened, B decreases. This induces a clockwise current 
in Q.
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