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Q1
(a)
The magnetic field intensity H of an electromagnetic wave propagating in
free space in the z-direction is described in phasor form by H = îHe¯
where B is its phase constant. Determine the corresponding electric field from
Ampere's law.
[8]
A long straight wire in air carries a current of 5 A. What is the magnetic field
intensity H at a radial distance of 5 m from the wire?
(b)
[4]
A battery of open circuit voltage 2 V and internal resistance 50 SN is connected
via a rapid switch to a transmission line of characteristic impedance 50 N
terminated in a load of 100 . Calculate the voltage and current on the line
just after the switch is closed, explaining your answer carefully.
(c)
[6]

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