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Q. A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance r1 from the source the sound is 3.9 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2?

Q. Two 10-cm-diameter charged thin rings face each other, 25 cm apart. The left ring is charged to -25 nC and the right ring is charged to +25 nC. a. What is the electric field , both magnitude and direction, at the midpoint between the two rings? b. Calculate the force on a 1.4 nC charge placed at the midpoint?

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