1.

Coils P and Q each have a large number of turns of insulated wire. When switch S is closed, the pointer of galvanometer G is deflected toward the left (as shown in the following figure). With Snow closed, to make the pointer of G deflect toward the right one could

Answer»

Move the SLIDE of the rheostat R QUICKLY to the right
Move coil P TOWARD coil Q
Move coil Q toward coil P
Open S

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