Question

.The length of a conducting is 60.0 m and its radius is 0.5cm. A potential difference
of 5.0 V produces a current of 2.5 A in the wirwiree. Calculate the resistivity of the material
of the wire.
2 marks​

Answer 1

Explanation:

Resistance, R = PL/A where P = Resistivity of material

From ohms law, We know that V= IR. So, R = V/I

Given, V = 5V and I = 2.5A. So, R = 5/2.5 = 2ohms.

Therefore, P = Resistivity of material = AR/L

Assuming, wire is in circular, Area = pi*r*r

0.5cm = 0.005m

Area = 22/7 * 0.005* 0.005= 0.00007857

P = 0.00007857*2/60= 0.000002619.

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