Please answer all the questions In a copper wire that has a diameter of 1.48 mm,
ID: 3308039 • Letter: P
Question
Please answer all the questions
In a copper wire that has a diameter of 1.48 mm, the drift velocity is 6. 48 104 m/s Assume one free electron per copper atom Part A What is the current in the wire? Express your answer with the appropriate units. Value Units Submit Reatiest Answer Part B What is the current density? A/w? submi Part c This wire connects a light bulb, power source, and switch in a cincuit, and the distance between the swtch and buib is 300 m. How long does it take for an election asbally at the switch to reach the bulb?Explanation / Answer
current is defined by,
i = n*A*Vd*e
where , n=number of free electrons per unit volume
A=area of cross-section
Vd=drift velocity
e=1.6*10^(-19)
n=1*6.02*10^(23) ( n is taken for one mole of copper atoms)
therefore,
(A) i = 0.107 mA
(B) current density ,
J=i/A=62.2 A/m^2
(c) Time to reach the bulb,
T=distance * drift velocity
=0.2 * 10^(-2) s