Explain the following :
How does the resistance of a wire vary with its area of cross-section?

How does resistance of a metal vary with temperature?

How does electric field vary with drift velocity?

How does the value of rate constant vary with reactant concentration?

State how resistance of a conductor depends upon length and cross-section.

Find the resistance of a silver wire of length 5m and area of cross-section 4mm^2 . Resistivity of a silver is 1.6xx10_-8 Omega m.

A wire of given material having length I and area of cross-section A has a resistance of 8Omega . What would be the resistance of another wire of the same material having length l/2 and area of cross-section 4A?

Will the bends in a wire effect its resistance?

A galvanometer having a resistance of 50Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross section 3×10^−3 cm^2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is [specific resistance of the wire =5×10^−7 Ωm]