. A current density of 100,000 A/cm2 flows through a sodium wire 75 m in length. The resistance of the wire is found to be 3 ohm. Calculate the diameter of the wire (in cm) and the voltage applied to the wire (in V).
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- An aluminum wire 7.5 m long is connected in parallel with a copper wire 6 m long. When a current of 5 A is passed through the combination it is found that the current in aluminum wire is 3 A. The diameter of aluminum wire is 1 mm. Determine the diameter of the copper wire. Resistivity of copper is 1.7 x 10 -6 ohm-cm and that of aluminum is 1.724 micro-ohm-cm.Some copper wire has a resistance of 200 at 20 ° C . A current is passed through the wire and the temperature rises to 90 ° C . Determine the resistance of the wire at 90 ° C , correct to the nearest ohm , assuming that the temperature coefficient of resistance is 0.004 / C at 0 ° CAn aluminum wire 5m long and 2mm diameter is connected in parallel with a copper wire 3m long. The total current is 4 A and that in the aluminum wire is 2.5 A. Find the diametre of the copper wire. The resistivity of copper wire being 1.7 micro ohm meter and that of aluminum taken Al 2.6 micro ohm meter
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- An copper wire has a total length of 2820 inches (in.) and a cross-sectional area of 4in. by6 in. Find the resistance of the wire.Steady current circulation is desired for a lamp connected in a circuit to light. For this, explain how a stable current will occur from any part of the circuit with the conservation law of the charge.In a semiconductor crystal, the atoms are held together by: A) The interaction of valence electrons B) Ionic bonds C) Covalent bonds D) Forces of attraction Choose correct answer