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.

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

Calculate the resistivity of a wire having resistance .02 ohm, length = 10 m and area = 1mm^2

A steel wire of length 4.7 m and cross-sectional area 3.0 xx 10^- 5 m^2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 xx 10^-5 m^2 under a given load. What is the ratio of the Young’s modulus of steel to that of copper?

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?

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]

Find the surface area of a cylinder whose- Radius of the base is 4m and height 5.6m.

Find the length of the side of a square whose area is 441 m^2 .

The resistance of a 10m long wire is 10 Omega . Its length is increased by 25% by stretching. The resistance of the wire is now

Calculate the amount of work done for a wire which area of cross section 10^-6m^2 and length 1.5m to increase the length 4 xx 10^-3 m. Young's modules of elasticity 2 xx 10^(11N//m^2) .