In a conductor the charge carriers are positive and/or negative. For example, the charge carriers in a metal wire are the (negative) free electrons. The charge of an electron is -1.60 x 10-19 C. In an electrical wire made of copper a current of 16.0 A flows. How many electrons flow in 2.0s [Hint Current = Charge/time and charge= Current X time] %3D O A 16 0c

In a conductor the charge carriers are positive and/or negative. For example, the charge carriers in a metal wire are the (negative) free electrons. The charge of an electron is -1.60 x 10-19 C. In an electrical wire made of copper a current of 16.0 A flows. How many electrons flow in 2.0s [Hint Current = Charge/time and charge= Current X time] %3D O A 16 0c

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 24P: A conductor carries a current that is decreasing exponentially with time. The current is modeled as...

See similar textbooks

Similar questions

sq 4. Maximum surface resistance. Consider a square sheet of side L, thickness d, and electrical resistivity p. The resistance measured between opposite edges of the sheet is called the surface resistance: R = pL/ Ld = p/d, which is independent of the area of the sheet. (R is called the resistance per square and is expected in ohms per square, because p/d has the dimensions of ohms.) If we express p by p=m/ne²t, then Rq=m/ndet. Suppose now that the minimum value of the collision time is determined by scattering from surfaces of the sheet, so that Td/v, where v is the Fermi velocity. Thus the maximum surface resistivity is Rmvp/nd²e². Show for a monatomic metal sheet one atom thickness that sq Rħ/e² = 4.1k, where lkn is 10³ ohms. sq
Electric current Number 9 Number 10
1.9. A block of conductor has the dimensions Lo x 2Lo x 4Lo. As shown in the figure below, the same battery is connected across the conductor in three different configurations. Which configuration draws the smallest current from the battery? All configurations draw equal current. 21 Lo 4Lo 4LO (a) (b) (c) (d)
Solve the following: 1. How many nanocoulomb are there in 3.65 billion electrons ? 2. A 25 ampere electric current flows in a conductor in 75 millisecond. Find: a. current equivalent in mA? b. How many charges are transferred ? c. How much work is required to transfer if 3V is applied. 3. A charge of 3.5 µC present in an electric field produces a force of 0.008 Newton. What is the intensity of the electric field ? 4. A charge of 0.6 µC is placed in an electrostatic field whose intensity is 3 x 105 N/C. How strong is the force acting on the charge ? 5. Two objects are both negatively charge with 0.04 coulomb each and 140 cm apart. What kind of force exist Between charges? How much? 6. Find the force that exist between two charges of 8.53 μC and 4.5 µC that 0.25 meters in air?
1.15 When a car has a dead battery, it can often be started by connecting the battery from another car across its terminals. The positive terminals are connected together as are the negative terminals. The connec- Si tion is illustrated in Fig. P1.15. Assume the current i in Fig. P1.15 is measured and found to be 40 A. a) Which car has the dead battery? b) If this connection is maintained for 1.5 min, how much energy is transferred to the dead battery? Figure P1.15 12V 12V
A student woants to identify the Resistivity of a conducting wire of unknown material. Resistivity is a property of a material that quantifies how strongly it conducts electric current, and it is formulated as, of p= R4 where R is the Resistance (ohms), A cross-sectional area (meters-squared) and I is the length (meters) of the wire. The student runs an experiment on a cylindrical wire of a length l of 2 centimeters and the cross- sectional area A of the wire is 6.1 centimeters-squared. The measurements of the Current is as below Dataset Voltage (Applied, Volts) Current (Measured, Amperes)
A metallic wire with resistance 8 0, crosS-sectional area 8.2x10 m², and conductivity o= 5.81×10 0 m mV/m) inside the wire is; -1 is connected to a battery of & = 14 V. The electric field E (in 3.
A metal wire of cross-sectional area 2.00x10-6 m² and length 4.0 m has a current of 25.0 A uniformly distributed across that area. If the conductivity of the metal is, 5.9x107 (.m)-!, calculate the magnitude of the electric field, in V/m, along the wire?
An 18-gauge copper wire with a diameter of 3-mm carries a constant current of 1.2-A. The charge concentration in the wire is 8.5 x 1028 per cubic meter. The cross-sectional area is 0.0000015-m2. Determine the electric field in mN/C. Use q = 1.602 x 10-19 and resistivity equal to 1.72x10-8 ohm-m.
(1) What is a definition of electric current? Label the variables. (2) Suppose that 1016 electrons pass through a cross-section of a wire each second. What is the current in the wire? (3) The current in a wire varies with time according to the relation / = 5+3t where I is in amperes andt is in seconds. What is the number of coulombs of charge that pass a cross section of the wire between t=3s and t=5s?
Q3.a.Calculate the current density for Aluminum wire has radius 1mm and current 1mA? 318.31A/m? b. Calculate the drift speed for electrons in the wire ? 3.29*10-8 m/s if the pAL-2.7*103 kg/m3 and if you know that one mole in the Aluminum has mass equal to 26.98g and there is one conduction for each Aluminum atome?
67. A metallic wire has a diameter of 4.12mm. When the current in the wire is 8.00A, the drift velocity is 5.40×10−5m/s. What is the density of free electrons in the metal? Express the answer numerically in m−3m−3 to two significant figures.