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The effective power radiated by an antenna varies

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The effective power radiated by an antenna varies 

(A) inversely as the length of antenna 

(B) inversely as the square of the length of the antenna 

(C) directly as the length of antenna 

(D) directly as the square of the length of the antenna

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Best answer

The correct option is (B) inversely as the square of the length of the antenna.

Explanation:

Effective power radiated by antenna ∝ [1 / (length of antenna)2]. 

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