Question
Tue August 23, 2011

# Does galvanometer have polarity.if yes,please explain ,if no also please explain. give the use of the galvanometer .Elaborate please

Expert Reply
Wed August 31, 2011
A galvanometer does not have polarity as it can be connected either ways in a circuit. Galvanometer is used for the detection and comparison of current flowing through the circuit.
It shows the presence of current in the circuit & along which direction it is flowing i.e., from left to right or from right to left. When there is no current in the circuit needle stays at middle of the meter; but if current is flowing from left to right needle will deflect towards one side and if current is flowing from right to left needle will deflect towards other side. So, the galvanometer is basically to detect current and to show the direction of current in the circuit.
Related Questions
Wed January 18, 2017

# A cell of emf E and internal resistance r is connected to two external resistance R1 and R2 and a perfect ammeter.The current in the circuit is measured in four different situation: (i)without any external resistance in the circuit (ii)with resistance R1 only (iii)with Ri and R2 in series combination (iv)with R1 and R2 in parallel combination The currents measured in the four cases are 0.42A,1.05A,1.4A and 4.2A,but not necessarily in that order.Identify the currents corresponding to the four cases mentioned above.

Thu November 24, 2016

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