Chapter 4: Q5E (page 912)
An electron experiences a magnetic force of magnitudewhen moving at an angle of 60.0° with respect toa magnetic field of magnitude. Find the speed ofthe electron.
Short Answer
The velocity is
Chapter 4: Q5E (page 912)
An electron experiences a magnetic force of magnitudewhen moving at an angle of 60.0° with respect toa magnetic field of magnitude. Find the speed ofthe electron.
The velocity is
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Get started for freeAn electrical conductor designed to carry large currents has a circular cross section 2.50 mm in diameter and is 14.0 m long. The resistance between its ends is . (a) What is the resistivity of the material? (b) If the electric-field magnitude in the conductor is 1.28 V/m, what is the total current? (c) If the material has free electrons per cubic meter, find the average drift speed under the conditions of part (b).
An 18-gauge copper wire (diameter 1.02 mm) carries a current
with a current density of . The density of free electrons for
copper iselectrons per cubic meter. Calculate (a) the current in
the wire and (b) the drift velocity of electrons in the wire.
Copper has free electrons per cubic meter. A 71.0-cm
length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 A of
current. (a) How much time does it take for an electron to travel the length
of the wire? (b) Repeat part (a) for 6-gauge copper wire (diameter 4.12 mm)
of the same length that carries the same current. (c) Generally speaking,
how does changing the diameter of a wire that carries a given amount of
current affect the drift velocity of the electrons in the wire?
(a) What is the potential difference in the circuit of Fig. P25.62? (b) What is the terminal voltage of the battery? (c) A battery with emf and internal resistance is inserted in the circuit at d, with its negative terminal connected to the negative terminal of the battery. What is the difference of potential between the terminals of the battery now?
Question: A conducting sphere is placed between two charged parallel plates such as those shown in Figure. Does the electric field inside the sphere depend on precisely where between the plates the sphere is placed? What about the electric potential inside the sphere? Do the answers to these questions depend on whether or not there is a net charge on the sphere? Explain your reasoning.
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