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

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

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Physics
Railway tracks are banked on curves

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

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