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  1. A proton and an alpha particle both enter a region of uniform magnetic field B,
  2. A particle of mass M is executing oscillations about the origin on the x-axis.
  3. The decay constant of a radio isotope is λ. If A₁ and A₂ are its activities at time
  4. Which one of the following is not due to total internal reflection?
  5. An object is placed 30 cm away from a convex lens of focal length 10 cm and a sharp