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Q. An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1300 m/s when it enters a cylindrical tube of radius 0.700 cm centered on the x-axis. Inside the tube is a uniform electric field of 5.00 10-4 N/C pointing in the negative y-direction. How far does the particle travel before hitting the tube wall? Neglect any gravitational forces. Note: mα = 6.64 10-27 kg; qα = 2e.

Q. Two 10 cm diameter charged disks face each other, 20 cm apart. The left disk is charged to - 50 nC and the right disk is charged to + 50 nC .

What is the electric field vec E, both magnitude and direction, at the midpoint between the two disks?

What is the force vec F on a -1.0 nC charge placed at the midpoint?

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