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GATE Electrical 2017 Set 1 | Question: 5

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Consider an electron, a neutron and a proton initially at rest and placed along a straight line such that the neutron is exactly at the center of the line joining the electron and proton. At $t=0$, the particles are released but are constrained to move along the same straight line. Which of these will collide first?

  1. The particles will never collide.
  2. All will collide together.
  3. Proton and neutron.
  4. Electron and neutron.

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