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  1. During mean life of a radioactive element, the fraction that disintegrates is
  2. A body is hangfing from a rigid support by an inextensible string of length
  3. The mean free path of electrons in a metal is 4 x 10⁻⁸ m. The electric field
  4. A person can see clearly objects only when they lie between 50 cm and 400 cm from
  5. At which place, Earth’s magnetism becomes horizontal