An infinite Solenoid along the Z axis in cylindrical coordinate system has n tur
ID: 1768498 • Letter: A
Question
An infinite Solenoid along the Z axis in cylindrical coordinate system has n turns per meter and has a radius R. Current flows downward through the solenoid at constant 1A from time t=0 to t=10s then decreases by .1A/s for 10s then stays at a constant 0A The solenoid is wound such that downward current flows clockwise as viewd from the +Z axis looking down at the origin.
A) on a sketch line shown in the diagram below fill in the dots with X"s to indicate the currents at t=0
B)on the same sketch draw the magnetic field lines at t=0
C) choose a time when the elctric field magnitde is not 0 and sketch the electric field lines, clearly mark which lines are magnetic and which are electric, using different colors if possible, make sure to consider the electric field both inside and outside the solenoid
D)sketch the electric field magnitude at some fixed position you choose as a function of time, the sketch need only be qualitativley correct not quantitativley.
E) choose a time when the electric field magnitude is not zero and find the electric field magnitude E(r) is inside and outside the solenoid
F) How would the answer to part e) change if this were a semi infinite solenoid, that is the solenoid extends from Z=negative infinity to 0, and you are asked to find E(r,z=0) explain your reasoning
Explanation / Answer
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