Current Electricity and Electrical InstrumentMedium
Question
In the standard post office box setup. Mark the INCORRECT statement :-
Options
A.the null point reading implies the position of jockey for which reading of galvanometer is zero.
B.the null point reading means consecutive readings at which the galvanometer deflects in the opposite direction.
C.the key connected to Galvanometer is switched on after switching on the key connected to battery.
D.the key connected to Galvanometer is switched off before switching off the key connected to battery.
Solution
In the standard PO experiment, reading are taken such that the galvanometer deflects in opposite direction. The key connected to galvanometer is switched on after the key of the battery so as to reduce the inductive effect in the circuit while taking the reading. The same is true while switching off the set-up. Note : Refer the PO Box experiment.
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