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1. A measurement of the speed of an electron gives 3.9 x 10^6 m/s with an uncertainty of 10%. What is the minimum uncertainty of

1. A measurement of the speed of an electron gives 3.9 x 10^6 m/s with an uncertainty of 10%. What is the minimum uncertainty of its position in nm?

2. A long and thin rod, parallel to the y axis, is located at x= +1.90 cm. The rod carries a uniform charge density of 3.10 nC/m. What is the modulus of the electric field at the origin?

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