Discussion
In a railway track at a curve, the outer track/edge is comparatively raised in height than the inner edge in order to _________ .
Answer: C
The outer rail is raised to obtain the necessary centripetal force, as the key's option puts it, from the horizontal component of the force on the train.
A train going round a curve needs a centripetal force directed towards the centre of the curve. Raising the outer rail (superelevation or banking) tilts the track, so the reaction force of the rails on the wheels leans inward, and its horizontal component supplies that centripetal force. Strictly it is the normal reaction, not the weight itself, that is tilted, but the purpose is the one the option states.
This keeps the flanges of the wheels from pressing hard on the outer rail and reduces wear. Centrifugal force is not something the track needs to supply, friction is not avoided by banking, and banking is designed to allow a speed, not to reduce it.
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