A small sphere with mass 1.20 hangs by a thread between two, Ask an Expert

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Q. A small sphere with mass 1.20 hangs by a thread between two large parallel vertical plates 5apart. The plates are insulating and have uniform surface charge densities and. The charge on the sphere is = 8.80×10-6.

Q. A bat flying in a cave emits a sound and receives its echo 0.1 s later. What is the distance from the bat to the wall of cave? Suppose speed of sound is 340 m/s.

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