I worked out the fields radiated by an electric dipole in class and they are also in Section 11.1.2 of the text. These fields carry energy away and we know the radiated power. From the point of view of the source of the time dependent current (and charge) in the dipole, the antenna could just as well be a resistance with resistance R. Find the value of this resistance, known as the "radiation resistance."

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emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50