Two copper wires A and B have the same length and are connected across the same battery. If RB = 8RA,determine the ratio of their cross-sectional areas.
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Two copper wires A and B have the same length and are connected across the same battery. If
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- A scientist just bought a very cool magnet, and would like to measure it’s strength. She takes a stripof copper with width 3.0cm, and a rectangular cross-section of 0.004m^2 and runs a current of 0.5Athrough it. She knows copper has a free charge density of 8.491× 10^28 m−3. She holds the magnetnear the strip, and measures a voltage across the sides of the strips, and her voltmeter reads 11.2 nV-what is the strength of her magnet?A potential difference of 2.20 V will be applied to a 43.00 m length of 18-gauge silver wire (diameter = 0.0400 in). Calculate the magnitude of the electric field within the wire.Problem 3: A 1.2 g wire has a density of 2.7 g/cm3 and a resistivity of 2.7 × 10−8 Ωm. The wire has a resistance of 15 Ω. a) How long is the wire? b) The wire is made up of atoms with valence 1 and molar mass 26.98 g/mol. What is the drift speed of the electrons when there is a voltage drop of 30 V across the wire?
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