At a distance r 1 from a point charge, the magnitude of the electric field creat

Question

At a distance r1 from a point charge, the magnitude of the electric field created by the charge is 264  N/C. At a distance r2 from the charge, the field has a magnitude of 129  N/C. Find the ratio r2/r1.

At a distance r1 from a point charge, the magnitude of the electric field created by the charge is 264 N/C. At a distance r2 from the charge, the field has a magnitude of 129 N/C. Find the ratio r2/r1. An electric field of 64000 N/C points due west at a certain spot. What is the magnitude of the force that acts on a charge of -9.1C at this spot?

Explanation / Answer

The field obeys the inverse-square law. c1/c2 = 269/129 Which must be the inverse square of the ratio r1/r2. So: r1/r2 = ?(129/269) = .6925 r2 / r1 = 1 / .6925 = 1.444

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