(a) The magnitude of current density is given by
The direction of and
is same for
positive charge carriers and opposite for negative charge
carriers.
(b) Given:
I=115A, A=31.2mm2, L=85.5cm, n=8.49*1028/m3
The drift velocity of the electron is given by
The current density in the wire is
The time taken is
Help please Current Density and Drift Speed A group of charges, each with charge q, moves...
the emf provided by the battery
is 12.6 V
1 Current Density and Drift Speed a) (8 pts) A group of charges, each with charge q, moves with velocity v. The number of particles per unit volume is n. What is the current density J of these charges, in magnitude and direction? Make sure that your answer has units of Alm b) (8 pts) We want to calculate how long it takes an electron to get from a car battery...
1. When a current flows in an aluminum wire of diameter 4.67 mm, the drift speed of the conduction electrons is 0.000135 m/s. How many electrons are flowing past a given point each second? The conduction electron density in aluminum is 6.00×1028 m−3. 2. When a current flows in an aluminum wire of diameter 2.15 mm, the drift speed of the conduction electrons is 0.000249 m/s. How many electrons are flowing past a given point each second? The conduction electron...
2. (30) The starter motor of a car engine draws a current of 150 A from the battery. The copper wire to the starts motor is 5.0 mm in diameter and 1.2 m long. The starter motor runs for 0.80 s until the car engine (a) What is the drift velocity of the electrons in the current? (b) What is the voltage across the wire? motor while it starts? (c) How many electrons travel through the starter
Question 1: a) What are current density and drift speed? Why is the drift speed always smaller than the actual speed of electron? (4) I b) 10.0 m length of wire consists of 4.0 m of copper followed by 6.0 m of aluminum, both of diameter 1.4 mm. A voltage difference of 80 mV is placed across the composite wire (a) What is the total resistance (sum) of the two wires? (b) What is the current through the wire? (c)...
An iron wire has a cross-sectional area of 5.80 ✕ 10−6 m2. Carry out steps (a) through (e) to compute the drift speed of the conduction electrons in the wire. (a) How many kilograms are there in 1 mole of iron? kg/mol (b) Starting with the density of iron and the result of part (a), compute the molar density of iron (the number of moles of iron per cubic meter). mol/m3 (c) Calculate the number density of iron atoms using...
A small but measurable current of 8.7 × 10-10 A exists in a copper wire whose diameter is 2.3 mm. The number of charge carriers per unit volume is 8.49 × 1028 m-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.
A small but measurable current of 8.9 × 10-10 A exists in a copper wire whose diameter is 2.2 mm. The number of charge carriers per unit volume is 8.49 × 1028 m-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.
A small but measurable current of 9.3 x 10-10 A exists in a copper wire whose diameter is 3.6 mm. The number of charge carriers per unit volume is 8.49 x 1028 m-3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed.
0 A exists in a copper wire whose diameter is 3.6 mm. The number of charge carriers per unit volume is 8.49 x 1028 m 3. Assuming the current is uniform, calculate the (a) current density and (b) electron drift speed. (a) Number (b) Number Units Units
A silver wire of diameter 1.6 mm carries a current of 130 mA. The density of conduction electrons in silver is 5.8 times 10^28 m^-3. How long (on average) does it take for a conduction electron to move 1.0 cm along the wire? Min