- #1

physics16102

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The electric field E (arrows) is produced by a point charge. Find R in meters

## Homework Equations

E(due to pt charge) = kq/R^2

# of field lines/unit area represents relative field strength (only statement in my notes that seems to apply to problem)

## The Attempt at a Solution

I assumed the two areas are equal, and the relative strengths are 5Q and 2Q, respectively. Then, k5Q/(1.5)^2 = k2Q/R^2 I solved and got .77, and neither .77 or 1.5+.77 are answer choices so I am obviously wrong. This problem is obviously supposed to be very easy since it is the first one on my practice test but it is nothing like anything in the book or examples done is class so I am clueless.