Physics
A galvanometer can be converted into a voltmeter by connecting with it a

High resistance on series
High resistance in parallel
Low resistance on parallel
Low resistance in series

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
necessary centripetal force may be obtained from the horizontal component of the weight of the train
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels

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