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  1. A sample of radioactive element has a mass of 10 gram at an instant t=0.
  2. Electrons in the atom are held to the nucleus by
  3. A galvanometer coil has a resistance of 15 ohm and gives full scale deflection
  4. An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
  5. A solid sphere, disc and solid cylinder all of the same mass and made up of same material