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Physics Help (Transport Equation)?
Hi, a few questions here:
1. The beam of electrons in a cathode ray tube contains electrons travelling at 8.4 x 10 to the power of 6 metres per second. The current through the tube is 2.8 micro Amps.
a) How many electrons are emitted per second from the cathode of the tube?
b) What is the number of electrons per unit length of the beam.
Final question:
2) A direct current of 3 Amps through a copper wire reaches a place where the area of cross section of the wire changes from 2 x 10 to the power of -6 metres squared to 0.090 x 10 to the power of -6 metres squared. By what factor does the drift speed of the electrons increase as they move from the wide to the narrow section?
Answers will be much appreciated. Thanks.
1. The constant to know is the charge of an elementary particle q(e) = 1.6022E-19 C.
A. Then electrons/s = I/q(e) = 2.8E-6/1.6022E-19
B. electrons/m = (electrons/s)/(m/s) = (electrons/s)/v
2. Assuming flow velocity vdrift is always uniform throughout the cross-section, vdrift*area remains constant.
Micro-T Custom shim diff with copper wire
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