JAMB - Physics (1992 - No. 32)
A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire
1.5 x 10-4m2
1.0 x 10-4m2
2.7 x 10-5m2
7.3 x 10-6m2
توضيح
Resistivity = \(\frac{\text {Resiatance x Area}}{length}\)
1.6 x 10-6 = \(\frac{15 \times Area}{0.27}\)
Area = 1.0 x 10-4m2
1.6 x 10-6 = \(\frac{15 \times Area}{0.27}\)
Area = 1.0 x 10-4m2