The current supplied to a lamp with a 100-W light bulb is 0.87 amps. The lamp is wired using a copper wire with a diameter of 2.588 mm (10-gauge). Find the magnitude of the current density (in A/m2).

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Q: 45° B m 50 N 693 N O 490 N 203 N A

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Q: the inclination

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Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.