A. il= qv
B. iq = lv
C. i/l=q/v
D. none of the mentioned
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A. il= qv
B. iq = lv
C. i/l=q/v
D. none of the mentioned
This equation states that the time change in current, I, multiplied by the length of the current element, l, is equal to the charge, q, multiplied by the velocity, v. This fundamental equation is used to determine the radiation pattern of an antenna, which is the directional (angular) dependence of the strength of the radio waves from the antenna.
The total power radiated in all directions is divided by the square of the maximum net (or effective) current causing the radiation and this quantity is known as field strength. Field strength is used to represent the radiation pattern of an antenna and is usually measured at a point located some distance away from the antenna.