. What is the approximate resolution of a circular microwave antenna having an aperture of 1 m and orbiting at an altitude of 800 km? Use a wavelength of 5 cm. (Resolution here means the diffraction-limited resolution: the diameter of the first zero crossing of the illumination pattern).

Answer mechanical energy;

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

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