The relative error in the determination of the surface area of sphere is $$\alpha $$. Then the relative error in the determination of its volume is :

A given object takes n times more time to slide down a $${45^ \circ }$$ rough inclined plane as it takes to slide down a perfectly smooth $${45^ \circ }$$ incline. The coefficient of kinetic friction between the object and the incline is :

The equivalent capacitance between $$A$$ and $$B$$ in the circuit given below, is :

In the given circuit all resistances are of value $$R$$ $$ohm$$ each. The equivalent resistance between $$A$$ and $$B$$ is :