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 theostat has `1000` turn a wire radius `0.4 mm` having resistivity `

1.	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.
Answer» Correct Answer - `24.5 Omega` Here length of wire used , `l = 100 pi D` `R = (rhol)/(pi r^(2)) = (rho 100 pi D)/(pi r^(2)) = (100 rho D)/(r^(2))` `= (100 xx (4.9 xx 10^(-8)) xx (5.0xx 10^(-2)))/((0.1 xx 10^(-3))^(2)) = 24.5 Omega`

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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.

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