1 1 point All other things being equal, current will be larger in a wire that has a larger value of net charge. the coefficient of current. resistivity. conductivity. potential
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Step 1: The relationship between current, voltage, and resistance is given by Ohm's law: $$I = \frac{V}{R}$$, where I is the current, V is the voltage, and R is the resistance. Show more…
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Two wires are made of the same material and have the same amount of current flowing through them. Wire 1 has a greater cross-sectional area than wire 2. The current density in wire 1 is [ Select ] the current density in wire 2. The drift velocity in wire 1 is [ Select ] the drift velocity in wire 2.
Adi S.
The electron drift speed is small and the charge of the electron is also small but still, we obtain a large current in a conductor. This is due to (a) the conducting property of the conductor (b) the resistance of the conductor is small (c) the electron number density of the conductor is small (d) the electron number density of the conductor is enormous.
Learning Goal: To understand the nature of electric current and the conditions under which it exists. Electric current is defined as the motion of electric charge through a conductor. Conductors are materials that contain movable charged particles. In metals, the most commonly used conductors, such charged particles are electrons. The more electrons that pass through a cross section of a conductor per second, the greater the current. The conventional definition of current is given by the equation I = Q/t, where I is the current in a conductor and Q is the total charge passing through a cross section of the conductor during the time interval t. Part D: You are presented with several wires made of the same conducting material. The radius and drift speed are given for each wire in terms of some unknown units and v. Rank the wires in order of decreasing electron current. Rank from most to least electron current. To rank items as equivalent, overlap them. 1. radius = 1r, drift speed = 5v 2. radius = 3r, drift speed = 1v 3. radius = 4r, drift speed = 0.5v 4. radius = 2r, drift speed = 2.5v In summary, the two conditions for electric current in a material are the presence of movable charged particles in the material and the presence of an electric field. Quantitatively, the motion of electrons under the influence of an electric field is described by the drift speed, which tends to be much smaller than the speed of the random motion of the electrons. The number of electrons passing through a cross section of a conductor depends on the drift speed (which, in turn, is determined by both the microscopic structure of the material and the electric field) and the cross-sectional area of the conductor.
Ivan K.
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