Author Question: A Tungsten w ire is 1.50 m long and has a diameter of 1.00 mm. At 20.C a current of 50. mA flows ... (Read 52 times)

jwb375 · **on:** Jul 27, 2018

A Tungsten w ire is 1.50 m long and has a diameter of 1.00 mm. At 20.C a current of 50. mA flows through the wire. =5.6 10-8 m; =0.0045(C)-1

(a) Determine the potential across the wire.
(b) If the wire temperature increases by 100. C, what potential is now required to produce a current of 50. mA?

Question 2

Which scientist built a radio transmitting tower at the turn of the 20th century and claimed that he was receiving interplanetary communications with it?

A) Guglielmo Marconi
B) Thomas Edison
C) Nikola Tesla
D) Grote Reber