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A charge of +2.20 μμC is at the origin and a charge of -3.20 μμC is...

A charge of +2.20 μμC is at the origin and a charge of -3.20 μμC is on the y axis at y = 40.0 cm.

1) What is the potential at point a, which is on the x axis at x = 40.0 cm? (Express your answer to three significant figures in kV​)

2) What is the potential difference Vb - Va when point b is at (40.0 cm, 30.0 cm)? (Express your answer to three significant figures in kV​​.)

3) How much work is required to move an electron at rest from point a to rest at point b? (Express your answer to three significant figures in ×10^−15J)

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