A small, electrically charged object A creates an electric field. At a point located 0.3 m directly north of A, the field has a value of 50 N/C directed to the south. What is the charge of object A

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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