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The diagram represents a primary coil P , carrying a steady current, and a secondary coil S, which is connected to a galvanometer G .
The diagram represents a primary coil
P
, carrying a steady current, and a secondary coil S, which is connected to a galvanometer
G
.\ The following steps are performed one after another.\ I.
P
is pushed rapidly into
S
\ II.
P
is held stationary inside
S
\ III.
P
is withdrawn rapidly from
S
\ IV.
P
is held stationary outside of
S
\ During which of these steps does
G
show a steady zero reading?\ I and III only\ II only\ II and IV only\ II and III only\ I only
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