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  1. In radioactive element, β-rays are emitted from
  2. An aicraft executes a horizontal loop of radius 1 km with a speed of 900 kmh⁻¹
  3. The Boolean expression P+ P ̅ Q, where P and Q are the inputs of the logic
  4. Two metal spheres of radii 0.01m and 0.02m are given a charge of 15mC and 45mC
  5. The nuclear radius of a certain nucleus is 7.2 fm and it has a charge of 1.28×10⁻¹⁷ C.