Discussion
The force responsible for the flow of water in river is
Answer: A
The force is the force of gravitation.
Water in a river flows downhill from higher to lower ground because gravity pulls it towards the Earth's centre. The steeper the slope of the river bed, the faster it flows.
Friction with the river bed and banks opposes the flow rather than driving it, and electrostatic and magnetic forces play no part in it.
It is the component of gravity along the sloping river bed that carries water from the river's source in the hills down to the sea.
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