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A -3.4 nC charge is on the x-axis at x1 = -7 cm and a 4.2 nC charge is on the x-axis at x2 = 13cm.
At what point or points on the y-axis is the electric potential zero?
Express your answer using two significant figures.
A string with a length of 0.5 meters is vibrating with a frequency of 100 Hz and it forms a standing wave at the fundamental mode with a velocity of 100 m/s. What is the new frequency of vibration on the sting
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