In a vacuum, two particles have charges of q1 and q2, where q1 = +3.3c. they are separated by a distance of 0.24 m, and particle 1 experiences an attractive force of 4.1 n. what is the value of q2, with its sign?

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked