Wire C and wire D are made from different materials and have length Lc = Lp = 2.4 m. The resistivity and diameter of wire C are 5.0 × 10-6 Q.m and 1.32 mm, and those of wire D are 1.2 × 106 Q2•m and 0.79 mm. The wires are joined as shown in the figure and a current of 4.9 A is set up in them. What is the electric potential difference between (a) points 1 and 2 and (b) points 2 and 3? What is the rate at which energy is dissipated between (c) points 1 and 2 and (d) points 2 and 3? C ·Lc (a) Number i 4.3e-5 Units V (b) Number 2.9E-5 Units V (c) Number i 2.1e-4 Units W 2 (d) Number i 1.4e-4 Units W D -LD 3

The figure gives the electric potential V(x) along a copper wire carrying uniform current, from a point of higher potential V, = 8.00 µV at x = 0 to a point of zero potential at x, = 2.60 m. The wire has a radius of 2.10 mm, and copper has a resistivity of 1.69 x 10-8 0-m. What is the current in the wire? V. x (m) Number i Units (A) A

The circuit shown in the diagram contains a battery and two wires made of the same material, but with different diameters. Each wire is 10 cm long, has 7 x 1027 mobile electrons per cubic meter, and an electron mobility of 5 x 10-5 (m/s)/(V/m). The diameter of wire 1 is 3 mm, and the diameter of wire 2 is 0.8 mm. Location A is inside wire 1, and location B is inside wire 2. A steady state current flows through the circuit. Show Transcribed Text B wire 1 wire 2 What is average drift speed of electrons at location B, inside wire 2? VB = m/s

A lightning rod on top of a building consists of an iron spike 1.5 m long with a circular crosssection of diameter 1.5 cm. During a lightning strike, the rod carries a current of 1000 A. What is the potential difference across the rod when this current flows? The resistivity of iron is 1.0 x 10-7 Ωm.

You have a battery marked "6.00 V." When you draw a current of 0.387 A from it, the potential difference between its terminals is 5.25 V. What is the potential difference AV when you draw 0.583 A? AV =