A two terminal when connected in series with a battery and a galvanometer in series with it through a two way key as shown in figure. The galvanometer shows maximum deflection which gradually decreases to zero, when key k_(1) is close and k_(2) open. Now key k_(1) is open and k_(2) is closed. Now battery is disconnected and galvanometer is directly connected to the same device the deflection in galvanometer is maximum and reversed and decreases to zero gradually. The device is-

A two terminal when connected in series with a battery and a galvano

1.	A two terminal when connected in series with a battery and a galvanometer in series with it through a two way key as shown in figure. The galvanometer shows maximum deflection which gradually decreases to zero, when key k_(1) is close and k_(2) open. Now key k_(1) is open and k_(2) is closed. Now battery is disconnected and galvanometer is directly connected to the same device the deflection in galvanometer is maximum and reversed and decreases to zero gradually. The device is-
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