Q. Two stationary point charges, charge 1 of magnitude 3.45 nC and charge 2 of magnitude 1.60 nC, are separated by a distance of 41cm. An electron is released from rest at the point midway between the two charges, and it moves along the line connecting two charges. What is the speed Vfinal of the electron when it is 10 cm from charge 1?
Q. You are standing 2.5 {rm m} straight in front of one of the two loudspeakers. They are 3 {rm m} apart and both are playing a 686 {rm Hz} tone in phase. As you begin to walk directly away from the speaker, at what distances from the speaker do you hear a least sound intensity? The room temperature is 20 ^circ {rm C}.