1.There are two wires, one is made of copper and the other one is silver. These two wires of the same length are made, one from each of the materials. Is it possible for each wire to have the same resistance? Yes, because the two wires have the same length. Yes, because copper and silver have the different resistivity. No, because the two wires have the same length. No, because copper and silver have the different resistivity. а. b. c. d.

Two pieces of copper wire have the same length, but wire A has square cross section of side s, whereas wire B has circular cross section of diameter s. Which of the following is TRUE? A. The resistivity of both wires is the same B. The resistance of both wires is the same C. The resistance of wire A is greater than B D. The resistance of wire B is greater than A

2 What is the SI unit of resistance? A Ω V F In solid metals, which charged particles are free to move throughout the object? Select any/all correct answers. protons neutrons electrons 4 Which factor(s) affect the current in a conductor? Select any/all correct answers. cross-section area density of the charged particles drift speed of the charged partiçles

Q5. A 4.80-m length of 2.0-mm-diameter wire carries a 750-mA dc current when 22.0 mV is applied to its ends. If the drift velocity is determine 1.7x105 m/s (a) the resistance R of the wire, (b) the resistivity and (c) the number n of free electrons per unit volume.

1. The sum of the resistance of resistors in series can sometimes be greater than the individual resistances. True or False 2. In planet mars the acceleration due to gravity there is also 9.81 m/s2. True or False 3. Vectors are quantity that has magnitude and direction. One example of it is density. True or False

6. A copper wire of cross-sectional area 2.0 x 10-6 m2 and length 4.0 m has a current of 2.0 A uniformly distributed across the area. (a) What is the magnitude of the electric field along the wire? (b) How much electrical energy is transferred to thermal energy in 30 minutes?