Questions
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
detailed solution
Correct option is D
Electric field, E=Vl=IRl (R = Resistance of wire)Magnetic field at the surface of wire, B=μ0I2πa (a = radius of wire)Hence, poynting vector, directed radially inward is given by S=EBμ0=IRμ0l⋅μ0I2πa=I2R2πalTalk to our academic expert!
Similar Questions
In a region of free space during the propagation of electromagnetic wave, the electric field at some instant of time t is and the magnetic field is The poynting vector for these fields at that point is
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