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  1. 10 mA current can pass through a galvanometer of resistance 25 ohm.
  2. An electric motor runs on DC source of emf 200 V and draws a current of 10 A.
  3. A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
  4. Two spherical nuclei have mass numbers 216 and 64 with their radii R₁ and R₂,
  5. A closely wound solenoid of 2000 turns and area of cross-section 1.5 x 10⁻⁴ m² carries