Optics Question 176
Question: A long straight wire of resistance R, radius a and length l carries a constant current I. The Poynting vector for the wire will be
Options:
A)
B)
C)
D)
Show Answer
Answer:
Correct Answer: D
Solution:
Electric field
(R = Resistance of wire) Magnetic field at the surface of wire
(a = radius of wire) Hence poynting vector, directed radially inward is given by
