[b]1. A 60.0 -cm-long hollow nichrome tube of inner diameter 1.10 mm, outer diameter 4.20 mm is connected to a 3.00 V battery. What is the current in the tube?
Homework Equations
Resistivity for nichrome = 1.5*10^-6 ohm meters
I=V/R
E=V/L
The Attempt at a Solution
[b]1. The electron beam inside a television picture tube is 0.300 mm in diameter and carries a current of 52.0 mu A . This electron beam impinges on the inside of the picture tube screen.
a)How many electrons strike the screen each second?
b)What is the current density in the electron...