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  1. In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
  2. A concave mirror of focal length f₁ is placed at a distance d from a convex lens
  3. The ratio of the nuclear radii of elements with mass numbers 216 and 125 is
  4. A toroid having 200 turns carries a current of 1 A. The average radius of the toroid
  5. Dimensions formula for surface tension is