6 Two conductors are made of the same material and have the same length. Conduct

Question

6 Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 2.0 mm and inside diameter 1.0 mm. What is the resistance ratio R/Rs, measured between their ends? the resistances are R1 = 1.002 and R2 = 2.0 , and the ideal batteries have emfs ,2.0 V and 2-63 4.0 V. What are the (a) size and (b) direction (up or down) of the current in battery 1, the (c) size and (d) direction of the current in battery 2, and the (e) size and (f) direction of the current in battery 3? (g) What is the potential difference Va - V,? 8 te,

Explanation / Answer

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6.

Resistance of wire is given by

R=pL/A

SInce resistivity and length are same

=>RA/RB =AB/AA =[pi*(22-12)*10-6/4]/[pi*12*10-6/4]

RA/RB =3

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