A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) Omega`m. The diameter of each turn is 3 cm. What is the maximum value of resistance that it can introduce ?

A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity 4.2 xx 10^-7Omega m. The diameter of each turn is 3 cm. What is the maximum value of resistance it can introduce?

A theostat has 1000 turn a wire radius 0.4 mm having resistivity 49xx 10^(-8) Omega m . The diameter of each turn is 4 cm. What are the maximum value of conductance and conductivity of rheostat wire.

A coil of 50 turns and 20 cm diameter is made with a wire of 0.2 mm diameter and resistivity 2xx10^(-6)Omega cm .The coil is connected to a source of EMF 20 V and negligible internal resistance. Find the current through the coil.

What length of a wire of diameter 0.46 mm and specific resistance 50xx10^(-6) Omega m would be required to make a coil of resistance 10 Omega ?

A wire has radius 0.5 mm and length 62.8 m. If the resistivity of the material of the wire is 5 times 10^(-7) Omega -m , find the resistance of the wire.

A copper wire has diameter 0.5 mm and resistivity of 1.6 xx 10^(–8) Omega m. What will be the length of this wire to make its resistance 10 Omega ? How much does the resistance change if the diameter is doubled?